Play Chess960 on the mobile apps
You can follow these steps on both the iOS and Android apps:
Tap the 'Play' button on your homescreen
Tap the 'More' dropdown menu and select 'Custom'
On the custom game screen, tap on 'Standard' and select 'Chess960' from the menu
Tap 'Play!' to start your game!
Check out this article to learn more about Chess960: What is Chess 960 or Fischer Random Chess?