Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 515)

515
Turning the Screen Off/On
You can set the camera so that the screen turns off and on as you press the
shutter button halfway in viewfi nder shooting.
1 Select [ 5 : Screen off /on btn].
2 Select an item.
 Remains on
The screen does not turn off when you press the shutter button halfway.
To turn off the screen, press the <
B
> button.
 Shutter btn.
The screen turns off when you press the shutter button halfway. To turn
on the screen, release the button.