[RobNY]

@RobNY
I've never used the collection field for filtering setlists, I just use the "All Fields" and the desired text. It does seem to do something but I don't know exactly what.

If you name your setlists along the lines of "group venue yyyy-mm-dd" e.g. "U3A St Peter's 2025-02-27", you can use the alphabetic letter to easily find all old lists for this group and/or venue (assuming sorted by Ascending Date)

When creating a new setlist, put one or more spaces at the start of the name e.g.  " U3A St Peter's 2025-02-27". This will put pu the entry at the top of the page (the "#" category) so easily visible.
After the gig, three vertical dots (top right), Rename without the leading space(s) to make it sort to the correct place.

Geoff

Yes, that's sort of how I'm doing it now.  But to address the original "archive" question I think that giving setlists their own version of a "collection" (or some tagging feature independent of the songs) could solve all these issues.  It would allow you to group/filter setlists by Band, Venue, and also have the ability to create 'archived setlist collections'.