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I have mine set to C2 (Focus Magnifier) on my A6500.
Works extremely well and I use it all the time.
Has to be either a MF lens (love my Canon FD1.2 with this), lens set to MF, or DMF selected.
I just press it twice and it punches in and I can confirm focus even better than focus peaking. (Use the arrow keys to move the frame around if what you want to focus magnify isn't in the center of the frame). Third press punches in slightly more, 4th one takes you back to where you were.
Should work the same on your A7R3.
I have my AF/MF selector set to DMF toggle that also works well with this setup for the AF lenses.
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