diff --git a/native/chat/chat.react.js b/native/chat/chat.react.js
index db4f6a526..2c7905712 100644
--- a/native/chat/chat.react.js
+++ b/native/chat/chat.react.js
@@ -1,437 +1,437 @@
 // @flow
 
 import {
   createMaterialTopTabNavigator,
   type MaterialTopTabNavigationProp,
 } from '@react-navigation/material-top-tabs';
 import {
   createNavigatorFactory,
   useNavigationBuilder,
   type StackNavigationState,
   type StackOptions,
   type StackNavigationEventMap,
   type StackNavigatorProps,
   type ExtraStackNavigatorProps,
   type StackHeaderProps as CoreStackHeaderProps,
   type StackNavigationProp,
   type StackNavigationHelpers,
   type ParamListBase,
 } from '@react-navigation/native';
 import { StackView, type StackHeaderProps } from '@react-navigation/stack';
 import invariant from 'invariant';
 import * as React from 'react';
 import { Platform, View, useWindowDimensions } from 'react-native';
 import { useSelector } from 'react-redux';
 
 import ThreadDraftUpdater from 'lib/components/thread-draft-updater.react.js';
 import { isLoggedIn } from 'lib/selectors/user-selectors.js';
 import {
   threadIsPending,
   threadMembersWithoutAddedAshoat,
 } from 'lib/shared/thread-utils.js';
 
 import BackgroundChatThreadList from './background-chat-thread-list.react.js';
 import ChatHeader from './chat-header.react.js';
 import ChatRouter, { type ChatRouterNavigationHelpers } from './chat-router.js';
 import ComposeSubchannel from './compose-subchannel.react.js';
 import ComposeThreadButton from './compose-thread-button.react.js';
 import FullScreenThreadMediaGallery from './fullscreen-thread-media-gallery.react.js';
 import HomeChatThreadList from './home-chat-thread-list.react.js';
 import MessageListContainer from './message-list-container.react.js';
 import MessageListHeaderTitle from './message-list-header-title.react.js';
 import MessageResultsScreen from './message-results-screen.react.js';
 import MessageStorePruner from './message-store-pruner.react.js';
 import DeleteThread from './settings/delete-thread.react.js';
 import EmojiThreadAvatarCreation from './settings/emoji-thread-avatar-creation.react.js';
 import ThreadSettings from './settings/thread-settings.react.js';
 import ThreadScreenPruner from './thread-screen-pruner.react.js';
 import ThreadSettingsButton from './thread-settings-button.react.js';
 import ThreadSettingsHeaderTitle from './thread-settings-header-title.react.js';
 import KeyboardAvoidingView from '../components/keyboard-avoiding-view.react.js';
 import SWMansionIcon from '../components/swmansion-icon.react.js';
 import { InputStateContext } from '../input/input-state.js';
 import CommunityDrawerButton from '../navigation/community-drawer-button.react.js';
 import type { CommunityDrawerNavigationProp } from '../navigation/community-drawer-navigator.react.js';
 import HeaderBackButton from '../navigation/header-back-button.react.js';
 import { defaultStackScreenOptions } from '../navigation/options.js';
 import {
   ComposeSubchannelRouteName,
   DeleteThreadRouteName,
   ThreadSettingsRouteName,
   EmojiThreadAvatarCreationRouteName,
   FullScreenThreadMediaGalleryRouteName,
   MessageResultsScreenRouteName,
   MessageListRouteName,
   ChatThreadListRouteName,
   HomeChatThreadListRouteName,
   BackgroundChatThreadListRouteName,
   type ScreenParamList,
   type ChatParamList,
   type ChatTopTabsParamList,
   MessageSearchRouteName,
   ChangeRolesScreenRouteName,
 } from '../navigation/route-names.js';
 import ChangeRolesHeaderLeftButton from '../roles/change-roles-header-left-button.react.js';
 import ChangeRolesScreen from '../roles/change-roles-screen.react.js';
 import MessageSearch from '../search/message-search.react.js';
 import SearchHeader from '../search/search-header.react.js';
 import SearchMessagesButton from '../search/search-messages-button.react.js';
 import { useColors, useStyles } from '../themes/colors.js';
 
 const unboundStyles = {
   keyboardAvoidingView: {
     flex: 1,
   },
   view: {
     flex: 1,
     backgroundColor: 'listBackground',
   },
   threadListHeaderStyle: {
     elevation: 0,
     shadowOffset: { width: 0, height: 0 },
     borderBottomWidth: 0,
     backgroundColor: 'tabBarBackground',
   },
 };
 
 export type ChatTopTabsNavigationProp<
   RouteName: $Keys<ChatTopTabsParamList> = $Keys<ChatTopTabsParamList>,
 > = MaterialTopTabNavigationProp<ScreenParamList, RouteName>;
 
 const homeChatThreadListOptions = {
   title: 'Focused',
   // eslint-disable-next-line react/display-name
   tabBarIcon: ({ color }) => (
     <SWMansionIcon name="home-1" size={22} style={{ color }} />
   ),
 };
 const backgroundChatThreadListOptions = {
   title: 'Background',
   // eslint-disable-next-line react/display-name
   tabBarIcon: ({ color }) => (
     <SWMansionIcon name="bell-disabled" size={22} style={{ color }} />
   ),
 };
 
 const ChatThreadsTopTab = createMaterialTopTabNavigator();
 function ChatThreadsComponent(): React.Node {
   const colors = useColors();
   const { tabBarBackground, tabBarAccent } = colors;
   const screenOptions = React.useMemo(
     () => ({
       tabBarShowIcon: true,
       tabBarStyle: {
         backgroundColor: tabBarBackground,
       },
       tabBarItemStyle: {
         flexDirection: 'row',
       },
       tabBarIndicatorStyle: {
         borderColor: tabBarAccent,
         borderBottomWidth: 2,
       },
     }),
     [tabBarAccent, tabBarBackground],
   );
   return (
     <ChatThreadsTopTab.Navigator screenOptions={screenOptions}>
       <ChatThreadsTopTab.Screen
         name={HomeChatThreadListRouteName}
         component={HomeChatThreadList}
         options={homeChatThreadListOptions}
       />
       <ChatThreadsTopTab.Screen
         name={BackgroundChatThreadListRouteName}
         component={BackgroundChatThreadList}
         options={backgroundChatThreadListOptions}
       />
     </ChatThreadsTopTab.Navigator>
   );
 }
 
 export type ChatNavigationHelpers<ParamList: ParamListBase = ParamListBase> = {
   ...$Exact<StackNavigationHelpers<ParamList>>,
   ...ChatRouterNavigationHelpers,
 };
 
 type ChatNavigatorProps = StackNavigatorProps<ChatNavigationHelpers<>>;
 function ChatNavigator({
   initialRouteName,
   children,
   screenOptions,
   defaultScreenOptions,
   screenListeners,
   id,
   ...rest
 }: ChatNavigatorProps) {
   const { state, descriptors, navigation } = useNavigationBuilder(ChatRouter, {
     id,
     initialRouteName,
     children,
     screenOptions,
     defaultScreenOptions,
     screenListeners,
   });
 
   // Clear ComposeSubchannel screens after each message is sent. If a user goes
   // to ComposeSubchannel to create a new thread, but finds an existing one and
   // uses it instead, we can assume the intent behind opening ComposeSubchannel
   // is resolved
   const inputState = React.useContext(InputStateContext);
   invariant(inputState, 'InputState should be set in ChatNavigator');
   const clearComposeScreensAfterMessageSend = React.useCallback(() => {
     navigation.clearScreens([ComposeSubchannelRouteName]);
   }, [navigation]);
   React.useEffect(() => {
     inputState.registerSendCallback(clearComposeScreensAfterMessageSend);
     return () => {
       inputState.unregisterSendCallback(clearComposeScreensAfterMessageSend);
     };
   }, [inputState, clearComposeScreensAfterMessageSend]);
 
   return (
     <StackView
       {...rest}
       state={state}
       descriptors={descriptors}
       navigation={navigation}
       detachInactiveScreens={Platform.OS !== 'ios'}
     />
   );
 }
 const createChatNavigator = createNavigatorFactory<
   StackNavigationState,
   StackOptions,
   StackNavigationEventMap,
   ChatNavigationHelpers<>,
   ExtraStackNavigatorProps,
 >(ChatNavigator);
 
 const header = (props: CoreStackHeaderProps) => {
   // Flow has trouble reconciling identical types between different libdefs,
   // and flow-typed has no way for one libdef to depend on another
   const castProps: StackHeaderProps = (props: any);
   return <ChatHeader {...castProps} />;
 };
 
 const headerRightStyle = { flexDirection: 'row' };
 
 const messageListOptions = ({ navigation, route }) => {
   const isSearchEmpty =
     !!route.params.searching &&
     threadMembersWithoutAddedAshoat(route.params.threadInfo).length === 1;
 
   const areSettingsEnabled =
     !threadIsPending(route.params.threadInfo.id) && !isSearchEmpty;
 
   return {
     // This is a render prop, not a component
     // eslint-disable-next-line react/display-name
     headerTitle: props => (
       <MessageListHeaderTitle
         threadInfo={route.params.threadInfo}
         navigate={navigation.navigate}
         areSettingsEnabled={areSettingsEnabled}
         isSearchEmpty={isSearchEmpty}
         {...props}
       />
     ),
     headerRight: areSettingsEnabled
       ? // This is a render prop, not a component
         // eslint-disable-next-line react/display-name
         () => (
           <View style={headerRightStyle}>
             <SearchMessagesButton
               threadInfo={route.params.threadInfo}
               navigate={navigation.navigate}
             />
             <ThreadSettingsButton
               threadInfo={route.params.threadInfo}
               navigate={navigation.navigate}
             />
           </View>
         )
       : undefined,
     headerBackTitleVisible: false,
     headerTitleAlign: isSearchEmpty ? 'center' : 'left',
     headerLeftContainerStyle: { width: Platform.OS === 'ios' ? 32 : 40 },
     headerTitleStyle: areSettingsEnabled ? { marginRight: 20 } : undefined,
   };
 };
 const composeThreadOptions = {
   headerTitle: 'Compose chat',
   headerBackTitleVisible: false,
 };
 const threadSettingsOptions = ({ route }) => ({
   // eslint-disable-next-line react/display-name
   headerTitle: props => (
     <ThreadSettingsHeaderTitle
       threadInfo={route.params.threadInfo}
       {...props}
     />
   ),
   headerBackTitleVisible: false,
 });
 const emojiAvatarCreationOptions = {
   headerTitle: 'Emoji avatar selection',
   headerBackTitleVisible: false,
 };
 const fullScreenThreadMediaGalleryOptions = {
   headerTitle: 'All Media',
   headerBackTitleVisible: false,
 };
 const deleteThreadOptions = {
   headerTitle: 'Delete chat',
   headerBackTitleVisible: false,
 };
 const messageSearchOptions = {
   // eslint-disable-next-line react/display-name
   headerTitle: () => <SearchHeader />,
   headerBackTitleVisible: false,
   headerTitleContainerStyle: {
     width: '100%',
   },
 };
 const messageResultsScreenOptions = {
   headerTitle: 'Pinned Messages',
   headerBackTitleVisible: false,
 };
-const changeRolesScreenOptions = {
+const changeRolesScreenOptions = ({ route }) => ({
   // eslint-disable-next-line react/display-name
   headerLeft: headerLeftProps => (
-    <ChangeRolesHeaderLeftButton {...headerLeftProps} />
+    <ChangeRolesHeaderLeftButton {...headerLeftProps} route={route} />
   ),
   headerTitle: 'Change Role',
   presentation: 'modal',
-};
+});
 
 export type ChatNavigationProp<
   RouteName: $Keys<ChatParamList> = $Keys<ChatParamList>,
 > = {
   ...StackNavigationProp<ScreenParamList, RouteName>,
   ...ChatRouterNavigationHelpers,
 };
 
 const Chat = createChatNavigator<
   ScreenParamList,
   ChatParamList,
   ChatNavigationHelpers<ScreenParamList>,
 >();
 
 type Props = {
   +navigation: CommunityDrawerNavigationProp<'TabNavigator'>,
   ...
 };
 export default function ChatComponent(props: Props): React.Node {
   const styles = useStyles(unboundStyles);
   const colors = useColors();
   const loggedIn = useSelector(isLoggedIn);
   let draftUpdater = null;
   if (loggedIn) {
     draftUpdater = <ThreadDraftUpdater />;
   }
 
   const headerLeftButton = React.useCallback(
     headerProps => {
       if (headerProps.canGoBack) {
         return <HeaderBackButton {...headerProps} />;
       }
       return <CommunityDrawerButton navigation={props.navigation} />;
     },
     [props.navigation],
   );
 
   const { width: screenWidth } = useWindowDimensions();
   const screenOptions = React.useMemo(
     () => ({
       ...defaultStackScreenOptions,
       header,
       headerLeft: headerLeftButton,
       headerStyle: {
         backgroundColor: colors.tabBarBackground,
         borderBottomWidth: 1,
       },
       gestureEnabled: true,
       gestureResponseDistance: screenWidth,
     }),
     [colors.tabBarBackground, headerLeftButton, screenWidth],
   );
 
   const chatThreadListOptions = React.useCallback(
     ({ navigation }) => ({
       headerTitle: 'Inbox',
       headerRight:
         Platform.OS === 'ios'
           ? () => <ComposeThreadButton navigate={navigation.navigate} />
           : undefined,
       headerBackTitleVisible: false,
       headerStyle: styles.threadListHeaderStyle,
     }),
     [styles.threadListHeaderStyle],
   );
 
   return (
     <View style={styles.view}>
       <KeyboardAvoidingView
         behavior="padding"
         style={styles.keyboardAvoidingView}
       >
         <Chat.Navigator screenOptions={screenOptions}>
           <Chat.Screen
             name={ChatThreadListRouteName}
             component={ChatThreadsComponent}
             options={chatThreadListOptions}
           />
           <Chat.Screen
             name={MessageListRouteName}
             component={MessageListContainer}
             options={messageListOptions}
           />
           <Chat.Screen
             name={ComposeSubchannelRouteName}
             component={ComposeSubchannel}
             options={composeThreadOptions}
           />
           <Chat.Screen
             name={ThreadSettingsRouteName}
             component={ThreadSettings}
             options={threadSettingsOptions}
           />
           <Chat.Screen
             name={EmojiThreadAvatarCreationRouteName}
             component={EmojiThreadAvatarCreation}
             options={emojiAvatarCreationOptions}
           />
           <Chat.Screen
             name={FullScreenThreadMediaGalleryRouteName}
             component={FullScreenThreadMediaGallery}
             options={fullScreenThreadMediaGalleryOptions}
           />
           <Chat.Screen
             name={DeleteThreadRouteName}
             component={DeleteThread}
             options={deleteThreadOptions}
           />
           <Chat.Screen
             name={MessageResultsScreenRouteName}
             component={MessageResultsScreen}
             options={messageResultsScreenOptions}
           />
           <Chat.Screen
             name={MessageSearchRouteName}
             component={MessageSearch}
             options={messageSearchOptions}
           />
           <Chat.Screen
             name={ChangeRolesScreenRouteName}
             component={ChangeRolesScreen}
             options={changeRolesScreenOptions}
           />
         </Chat.Navigator>
         <MessageStorePruner />
         <ThreadScreenPruner />
         {draftUpdater}
       </KeyboardAvoidingView>
     </View>
   );
 }
diff --git a/native/roles/change-roles-header-left-button.react.js b/native/roles/change-roles-header-left-button.react.js
index cceffb216..da1df2867 100644
--- a/native/roles/change-roles-header-left-button.react.js
+++ b/native/roles/change-roles-header-left-button.react.js
@@ -1,28 +1,58 @@
 // @flow
 
 import { HeaderBackButton as BaseHeaderBackButton } from '@react-navigation/elements';
+import invariant from 'invariant';
 import * as React from 'react';
-import { Text } from 'react-native';
+import { Alert, Text } from 'react-native';
 import { TouchableOpacity } from 'react-native-gesture-handler';
 
+import type { NavigationRoute } from '../navigation/route-names';
 import { useColors } from '../themes/colors.js';
 
-type Props = React.ElementConfig<typeof BaseHeaderBackButton>;
-function ChangeRolesHeaderLeftButton(props: Props): React.Node {
+type ChangeRolesHeaderLeftButtonProps = {
+  +route: NavigationRoute<'ChangeRolesScreen'>,
+  ...React.ElementConfig<typeof BaseHeaderBackButton>,
+};
+
+function ChangeRolesHeaderLeftButton(
+  props: ChangeRolesHeaderLeftButtonProps,
+): React.Node {
+  const { memberInfo, role: selectedRole } = props.route.params;
+  const { role: memberRole } = memberInfo;
+
+  const onCancel = React.useCallback(() => {
+    const { onPress } = props;
+    invariant(onPress, 'onPress must be defined');
+
+    if (selectedRole === memberRole) {
+      onPress();
+      return;
+    }
+
+    Alert.alert(
+      'Discard changes?',
+      'You have unsaved changes which will be discarded if you navigate away',
+      [
+        { text: 'Leave', onPress },
+        { text: 'Stay', style: 'cancel' },
+      ],
+    );
+  }, [memberRole, props, selectedRole]);
+
   const { panelForegroundSecondaryLabel } = useColors();
   const labelStyle = React.useMemo(
     () => ({
       color: panelForegroundSecondaryLabel,
       marginLeft: 10,
     }),
     [panelForegroundSecondaryLabel],
   );
 
   return (
-    <TouchableOpacity onPress={props.onPress}>
+    <TouchableOpacity onPress={onCancel}>
       <Text style={labelStyle}>Cancel</Text>
     </TouchableOpacity>
   );
 }
 
 export default ChangeRolesHeaderLeftButton;