Zoom in on EVF

[Cassillis]

Newbie with a beginners question.
This has been bugging me for a while, and I can't seem to find an answer.

I am using my new A7 iv, which I love.

I know that I can zoom in on parts of a saved image on the rear screen by double tapping etc.
But, is it possible to zoom in to a saved image whilst reviewing it through the viewfinder and if so, how?

 

[Unframed Dave]

Press the af on button, whilst viewing through the evf. It is also marked with a magnifying glass. You can zoom in and out and move around the image using the scroll wheel.

To go back to the full image, press the play button.