A family of Microsoft word processing software products for creating web, email, and print documents.
Had the same issue where my word document would shake when I was on an external monitor through a laptop expansion dock (HP Thunderbolt), after searching around and finding this fix for turning off animated controls the problem is fixed.
Control panel > System and security > System > Advanced system settings (in upper-left side) > Advanced tab > Settings in Performance box > Visual effects:
Here please disable Animate controls and elements inside windows