As above, transitioning from 2 decades of DSLR to Mirrorless underwater (have used Mirrorless on land for 6 or so years so comfortable).

Generally on my DSLR setup underwater and on land mirrorless i use the screen to shot the settings and menus but then look through the OVF/EVF to compose and take the image.

This isnt going to work now underwater as the face detection means i have the choice of screen OR EVF but not both or a different function on each.

What are people generally using? EVF for everything or screen?

Im aware i can map a button to toggle between but that sounds fiddly for each shot.

EVF 100% of the time. It is a huge win of the mirrorless designs.

• At least on Nikon, the EVF has two modes

  • Enhanced view - basically night vision that boosts the exposure of what you SEE (default)

  • Effect of Settings - WYSIWYG for cameras. Shows the effect of shutter and ISO on ambient lights. Amazing for wide angle natural light and exposing for the background water.

• After taking a shot the Preview is in the EVF, not the screen.

  • Shoot

  • Review

  • You don't need to move your head, rig, or disturb the subject or environment to look at the screen

These two things alone make the Mirrorless upgrade worth the cost. Add a 45deg viewfinder and it's perfection.

If i remember you started using the Canon R7 I have assigned the star button on the camera very easy to toggle from view finder to rear screen .