Tom Clancy's Rainbow Six Siege (PC) thinks I'm playing with a controller even though no controller is connected. Does anyone have a hint?

I've always been able to play R6 normally without any problems. But that was no longer the case that day. When I started the game, as always, and looked for a match, I suddenly couldn't move anymore, just look around with the mouse. When I looked around on my screen I saw that everything in the gamebar was as if I had connected an Xbox controller. But this is not the case. In the game settings I couldn't change anything that helped me with my problem, which is why I restarted the game first. After the restart, nothing changed. Then I tried to remove all USB devices from my PC except for the mouse. Without USB devices except for the mouse, I started the game again without success because still nothing had changed. My next attempt was to start another game where it would theoretically be possible to gamble with a controller. But there were no problems with these games.

Does anyone have a hint?

Activate the Xbox Game Bar.