With a mouse, you can use Magnifier in three different view: full-screen, lens, or docked. Try them all to find out which one you prefer
To open Magnifier on a keyboard, press the Windows logo key and + (plus sign). To open it by touch or mouse, go to Start , then Settings > Ease of Access > Magnifier, and then move the slider under Magnifier to turn it on.
Magnifier opens in full-screen view unless you change the settings.