feat(rn,flags) add fullscreen.enabled flag

react/features/base/flags/constants.js

  */
 export const FILMSTRIP_ENABLED = 'filmstrip.enabled';
 
+/**
+ * Flag indicating if fullscreen (immersive) mode should be enabled.
+ * Default: enabled (true).
+ */
+export const FULLSCREEN_ENABLED = 'fullscreen.enabled';
+
 /**
  * Flag indicating if the Help button should be enabled.
  * Default: enabled (true).

react/features/conference/components/native/Conference.js

 import LinearGradient from 'react-native-linear-gradient';
 
 import { appNavigate } from '../../../app/actions';
-import { PIP_ENABLED, getFeatureFlag } from '../../../base/flags';
+import { PIP_ENABLED, FULLSCREEN_ENABLED, getFeatureFlag } from '../../../base/flags';
 import { Container, LoadingIndicator, TintedView } from '../../../base/react';
 import { connect } from '../../../base/redux';
 import { ASPECT_RATIO_NARROW } from '../../../base/responsive-ui/constants';
      */
     _filmstripVisible: boolean,
 
+    /**
+     * The indicator which determines whether fullscreen (immersive) mode is enabled.
+     */
+    _fullscreenEnabled: boolean,
+
     /**
      * The ID of the participant currently on stage (if any)
      */
      * @returns {ReactElement}
      */
     render() {
+        const { _fullscreenEnabled } = this.props;
+
         return (
             <Container style = { styles.conference }>
                 <StatusBar
                     barStyle = 'light-content'
-                    hidden = { true }
-                    translucent = { true } />
+                    hidden = { _fullscreenEnabled }
+                    translucent = { _fullscreenEnabled } />
                 { this._renderContent() }
             </Container>
         );
         _calendarEnabled: isCalendarEnabled(state),
         _connecting: Boolean(connecting_),
         _filmstripVisible: isFilmstripVisible(state),
+        _fullscreenEnabled: getFeatureFlag(state, FULLSCREEN_ENABLED, true),
         _largeVideoParticipantId: state['features/large-video'].participantId,
         _pictureInPictureEnabled: getFeatureFlag(state, PIP_ENABLED),
         _reducedUI: reducedUI,

react/features/mobile/full-screen/middleware.js

 import { APP_WILL_MOUNT, APP_WILL_UNMOUNT } from '../../base/app';
 import { getCurrentConference } from '../../base/conference';
 import { isAnyDialogOpen } from '../../base/dialog/functions';
+import { FULLSCREEN_ENABLED, getFeatureFlag } from '../../base/flags';
 import { Platform } from '../../base/react';
 import { MiddlewareRegistry, StateListenerRegistry } from '../../base/redux';
 
         const { enabled: audioOnly } = state['features/base/audio-only'];
         const conference = getCurrentConference(state);
         const dialogOpen = isAnyDialogOpen(state);
+        const fullscreenEnabled = getFeatureFlag(state, FULLSCREEN_ENABLED, true);
 
-        return conference ? !audioOnly && !dialogOpen : false;
+        return conference ? !audioOnly && !dialogOpen && fullscreenEnabled : false;
     },
     /* listener */ fullScreen => _setFullScreen(fullScreen)
 );