eye-of-gnome was nearly perfect. But the "modernization" (e.g. GTK4 and some small ux changes) made me un-usable for me. I settled on eye-of-mate but there's still a few things I'd rather change (e.g. with zoomed-in pictures you can't use left/right arrow to go to the next one in the folder because now it move the viewport of the zoomed picture).

It's really unfortunate that those UX changes are not behind flags (I would have no issue with those being turned on by default which I could revert back easily)

EDIT/ But to be fair its more related at everything related to GTK4 for me, All the GTK3-era app were amazing, now I can't stand any of them and it pretty much made me switch to QT equivalent for most of them