12-01-2019, 12:50 PM
If the extended display has a different scaling % than your main display, then you will likely have problems. SaT requires all displays to have the same scaling % in Windows. See this page, and let me know if that fixes it:
https://www.stackandtile.com/sat/help/windows-10-fix
https://www.stackandtile.com/sat/help/windows-10-fix