Android: The theme can be changed inside the app
1. Go into your profile (select the person icon at the bottom of the screen)
2. Select the gear icon at the top right-hand corner of the screen, which will bring you to the settings
3. Under the heading ‘Preferences,’ tap ‘Theme’
5. Tap the option beside the theme (Light/dark)
5. Select one of the three options ‘Use OS Setting’, ‘Light,’ or ‘Dark’(If you select ‘Use OS Setting,’ it will use the setting of your phone to determine the theme)
Apple (iOS):
The settings of the phone determine the theme. If you want to change this, you will have to change it in the phone settings.
Follow this link for instructions: