Alright. You win. I didn’t think about the file being “kept open”, which sounds crazy, but I’ve been increasingly annoyed with XnView ever since I switched to Linux, and this Gwenview thing does seem MUCH better than the image viewers available on XFCE, so I’m almost “won over” and will probably drop XnView soon. Especially as it forces me to manually update it. But although I found keyboard shortcut configuration, there seems to be no mouse configuration? I kind of need the middle mouse button to toggle fullscreen on/off…