Issue with multiple monitors in CSGO
Issue with multiple monitors in CSGO
I'd look at the .ini file to verify it's tracking your cursor. Alternatively, you could join the Triple Monitor Gaming Club.
I couldn't get it to lock with the configurations. I had to use the DisplayFusion lock feature instead. The Community Hub mentions "Cursor Lock" and "Dual Monitor Tools." If those are available, test them first. If not, try DisplayFusion and adjust settings > functions > Lock/Unlock mouse to current window.