Thank you for your reply @Leo.
I got the solutions you provided to work (Preferences / Viewer / Standalone Viewer / Link both ways (file display selection tracks Lister-linked viewer) was turned on already. I got a bit confused as to why these didn't also work when left double-clicking image thumbnails to view them full screen (as set in my Preferences / Viewer);
...it took me a while to figure out from this post that I also had to modify the 'Images' File Type Group / Commands / Events for the Left double-click event;
Can the Right click context menu item 'View in Directory Opus' also be adjusted so that the viewer opens linked when clicked for overall consistency?
