Cursor always visible

Hey,

So sometimes or quite often when I play the game the cursor of the game shows up like in the pause menu but afterwards is still visible and I can't control the character. Sometimes its the game cursor, sometimes the windows cursor. This is also the reason i cant play the game in "borderless" screen mode since the game doesn't realize now it has to stick the cursor to the vision. Is there a hotkey where you can activate/deactivate the vision or make the cursor appear/disappear?

Best regards and thanks for the help.