macOS has a very nice feature called Quick Look that lets you see a popup of a file or image without having to leave your context (i.e., your folder in Finder) in order to get a large preview, and I would love to see that behavior in XnView MP. Obviously, there's already the preview pane, the full view screen/tab, and the "Open with [Application]" action. But sometimes your workflow calls for a layout with the preview pane or you just want a quick-n-easy "fit to screen" peek that doesn't leave or hide your current view. (On macOS, you just hit SPACEBAR to open or close Quick Look.)
As I write this, I'm conscious it could seem like I'm suggesting something that already exists, just without the name or with a slightly different workflow. I think the big thing that Quick Look has that distinguishes it is that it gives you the ability to get a large preview without having to have a preview panel open at all and still without having to fully open the image and lose your view of the context in the background.
Mac Quick Look behavior (or similar)
Moderators: helmut, XnTriq, xnview
Re: Mac Quick Look behavior (or similar)
similar request
Idea: Zoom/Loupe at thumbnail into it own area
although I don't see any problems with opening image in Viewer tab
Idea: Zoom/Loupe at thumbnail into it own area
although I don't see any problems with opening image in Viewer tab