Gamesir T4 Pro controller not working with Genshin Impact

Hi, how to change to controller [Gamesir T4 Pro] in the latest Genshin Impact (2025) version on a iPad Pro M5? I use the B-Home buttons at the controller and then connect via Bluetooth -> Ok with the iPad.

I do get the controller screen when pushing Home button at the controller and everything looks ok, but I can’t control the movement of the guy on screen with the joystick.

Where in Genshin Impact can I change from touchscreen to controller?

Best regards

Jan