Canon EOS R10 User Manual page 791

Note
[Screen dimmer] and [Screen off] apply while the shooting screen is displayed.
These settings do not apply during menu display or image playback.
The camera turns off during menu display or image playback after the time set in
[Screen dimmer], [Screen off], and [Auto power off] elapses.
To protect the screen, the screen turns off 30 min. after it is dimmed (although the
camera itself remains on), even if [Screen off] and [Auto power off] are set to
[Disable].
[Viewfinder off] also applies while the screen is still on. After this time elapses, the
viewfinder sensor is deactivated.
Only [Viewfinder off] applies during viewfinder display. After this time elapses, the
viewfinder sensor is deactivated and the viewfinder turns off.
Images on the screen are displayed at a lower frame rate after the screen dims
during still photo shooting standby.
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