Screen tearing during Preview is caused by your limited video card hardware.
You can minimize that by reducing target hardware, like from Desktop to Tablet, also instead of selecting “Maximum Quality”, try “Scalable 3D / 2D”.
Then once you upgraded your video card, you can set it back to “Maximum Quality”.
These settings can be selected during project creation, or if you already have a project, then go to “Edit” → “Project Settings” → “Target Hardware”