Newbie needs to know which window is the BEFORE; which is the AFTER (right or left?)

Some of my images appear to respond quite well - but after being away from the app for a few weeks - now I’ve forgotten which side is BEFORE and which is AFTER.

My current image has some characteristics that make it difficult to tell… It would be nice to have a label on which window is the << BEFORE and which is AFTER → and be able to switch them (L or R for comparison to similar images on another, closer monitor.) This is a relatively minor issue for me - and perhaps non-trivial for you, but it just occurred to me that I could raise the issue… : - )

on the left is before and on the right is after. :slight_smile: