[Geoff Bacon]

I see what you are trying to do now.

You could perhaps set up a temporary " Playable" set list collection before you leave for a gig  (leading space puts at top of ascending list of names) e.g

1. edit this set list and delete all entries (if not already empty)
   
2. select the collection field in the filters
   
3. select the collections you want to include
   
4. press the double left arrow (just above the top right hand column)
   

Then in a gig switch to this " Playable" set list for random songs.
Rather than scrolling down through this list (assuming it is big), you might find it easier to long press the initial letter in the alphabetic index and then press the next letter in the displayed drop down list. You can long press the subsequent letters if you want but the first three letters will probably get you near enough to perform a finger scroll to the required song

If you have only a few collections that you want to exclude, you could also experiment with the Mode field setting during step 3 above.

Not ideal in that you might have a lot of collections to select each time (either to ignore or include) but you can at least do this before a gig rather than scrabbling during the performance.
Depending on how often you update songs, you might find it easier to do this immediately after importing/configuring a batch of songs  (then you know it is in place for all gigs before you next decide to import/update).

Geoff