There is a small area (maybe 0.5cmx0.5cm on my 1920*1200 monitor) right in the center in the screen that is clickable.
To check this, aim your cursor in the middle, press and hold the right button and move the mouse at the same time. The camera will not move, or will barely move, and the cursor will keep blinking. In all other areas, camera moves. The area is very tiny, so you have to find it carefully.
You can also equip a bow or crossbow and zoom in to get the target reticle. It will be right in the middle.
All hidden GUI is not on this spot either.
I run the full-screen resolution, no Nvidia Experience or any other on-screen programs, and this ruins my movement quite often when the cursor moves, but the camera does not.
P.S. It appeared only after the last patch.