Subfolder thumbnails - like windows explorer?

Is it possible to have this?

for clarification:

say i have
music\artist\album1\folder.jpg
music\artist\album2\folder.jpg

when i'm viewing \music
\artist should have a thumbnail with two smaller thumbnail images inside it - the two folder.jpg inside \album1 and \album2.

I don't know if this can be set... or if it should be sent to feature requests...

Try:

Preferences > Listers > Thumbnails > Display thumbnails for folders > Generate thumbnails from etc.

No, you can't do this in Opus - the folder thumbnail function only looks inside the folder itself for images - it doesn't go recursively through sub-folders as well.

i guess i misunderstood ...