Canon EOS 80D Manual (en)

By clicking the [Detailed settings] button, you can set the 
following items for guide lines in the dialog box that appears.
• [Color]: Click the [Choose] button and select the color of the 
lines in the dialog box that appears.
• [Width]: Choose a value between 1 and 10 for the width of the 
guide lines.
• [Display aspect ratio while moving guides] checkbox: 
Checkmark this option to display the aspect ratio indication of 
the center box formed by the guide lines when moving them.
• [Target ratio]: If the checkbox above is checkmarked, you can 
change the target aspect ratio of the center box formed by the 
guide lines.
Clicking the [OK] button completes the setting and the dialog box 
Drag the guide lines to the desired position on the 
You can also enter values between 0.0 and 100.0 in the [1:] and 
[2:] boxes in [Horizontal ( 0.0 - 100.0 )] and [Vertical ( 0.0 - 100.0 )] 
to move the guide lines.
If the [Display aspect ratio while moving guides] checkbox is 
checkmarked in the dialog box that appears by clicking the 
[Detailed settings] button, an aspect ratio indication and the 
direction toward the target ratio are displayed when moving the 
guide lines.
Move and position the camera.
To hide the guide lines, uncheckmark [Show Guides].