Pressing F1 on a PS5 BlueTooth keyboard causes the reticle for controller actions in the cab to vanish, making control keyboard-only. For a game not using PS5 mouse and keyboard, this behavior is ridiculous. If Unreal Engine 4 is the problem, must we wait for TSW6 for a fix ?
F1 removes the entire HUD. Not a bug, not a UE issue. It's the way it's designed. If you press a button that removes the whole HUD, expect the HUD to disappear.
In the settings, under accessibility, you can set HUD type to 'off'. That should keep the reticle on the screen.