I’m coming back to the topic of enlarging a photo after clicking it in the gallery.
Yo wrote ” I apologize, but there doesn’t appear to be an option in the theme settings to include a zoom effect in the new window.”

BUT…
Watch this short video https://youtu.be/uHuxZky4rcM
When I click on a photo, it appears on a black background, then when I click on it again, the gallery returns.

SO it is possible !

And on my photos a magnifying glass appears and the photo enlarges to 1:1, which I don’t want.

How to make it look like in the video, i.e. without enlarging?