Hey themachinist,
You can force vsync on by running from a shortcut or commandline with -vsync. You can also see if limiting your FPS to 30 causes any change to this behavior, as described here: How do I lock the Editor to 30fps? - Programming & Scripting - Epic Developer Community Forums
Is screen tearing occurring just in editor, or does it happen in game, too? If in editor, does UI tear or is that just in Viewport?