I don't know, I can't think of any setting in AB that would cause that. If you close the app does screen still tear?
What's your PC specs and monitor? Reason i asked was to figure out the sort of performance your computer has and if monitor can keep up. Screen tearing happens if frames aren't in sync, like too many fps above refresh rate is a common cause. Vsync can help with that as it limits fps to the refresh rate of the monitor but vsync can also introduce peripheral input lag which is why VRR (Gsync/Freesync) is a thing to try tackle this, albeit VRR doesn't limit fps so can still get tearing if frames can exceed VRR range which is to the maximum Hz of the monitor. You either then manually limit fps 1~2 fps lower or use vsync in conjunction as it'll only enable if frames go over.