Games on Steam will show you whether they support your controller, and many games do indeed support a PS4 or PS5 controller ...
Right-click on Kingdom Come Deliverance 2 and select ‘Properties’. Go to the ‘Controller’ tab and select ‘Disable Steam Input ...
Unfortunately, there is still no workaround to get the Steam Deck to emulate a PS5's touchpad settings through the PS5 Plus ...
It benefits from a long history of Linux emulation. Recently the Steam Deck has been receiving PS4 emulation updates. The latest makes Bloodborne playable at an almost perfectly steady 30FPS.