Broken fullscreen mode

The side of my window that connects to my 2nd monitor isn’t stopping my cursor and it moves to the other in and out of game. I’m on Fullscreen but flipped through the others to see if it changed but it doesn’t. Also restarted SCII with no change.
Tips please!

Hey, Tacoman77! There’s a setting to toggle the mouse cursor confinement. Go to Options > Mouse and Keyboard, under Confine Mouse Cursor select “On” this should keep it within the window.