You can customize the settings by clicking on a three-line settings icon.

On your computer, it would be under the board.

Here you can customize board style, sounds (on or off), auto-queen promotion, indication of the opponents move and more. You can also ask Arena to show (or not) legal moves.

Once you finished setting up the playing space, just click ‘Save and close’ and the settings will be saved. You can change them anytime.

In your App, the same icon would be under the board.

You'll have to aections where you can customize your gaming process: Board and Game.