Cursor isn't locked to main monitor in fullscreen

[Legeoma]

As title says, I'm playing on fullscreen mode and the game says that when in fullscreen, I can't click out of the game and prioritizes it over other processes.
This is very annoying, cause I also want to move the camera with WASD and i'm sure it can also be annoying for other situations.

Anyone else experiencing this? Any fixes?

Thanks in advance.