Canon EOS 80D - Manual (Page 71)

71
You can display a grid in the viewfinder to help you check the camera tilt
or compose the shot.
1
Select [Viewfinder display].
 Under the [52] tab, select
[Viewfinder display], then press
<0>.
2
Select [Grid display].
3
Select [Show].
 When you exit the menu, the grid will
appear in the viewfinder.
Displaying the Grid
You can display a grid on the LCD monitor during Live View shooting and
before you start shooting a movie (p.270, 331).