your window is somewhere in the virtual space

try these:
alt + spacebar + x (it worked for me)

or
open another program
right click on taskbar and chose cascade windows

or
alt tab to opera
shift + right click opera icon
and chose move then use arrows or mouse

this post explains everything
https://desitsupport4u.des.wa.gov/hc/en-us/articles/360000289614-How-to-Move-a-Lost-Off-Screen-Window-Back-to-Your-Desktop