Hmm, quite the quandary.
Personally, if the choice is no identifier, or one that obscures part of the list, then I'd choose no identifier...
How about this?
Put the library identifier in the field where setlist and collection identifiers appear, BUT replace the library identifier when a set list or collection is selected.
In addition, if you're going to go to the trouble to write code to only show the overflow menu option to change libraries when additional libraries exist, why not reuse that code to only put the library identifier there under the same conditions.
(I'm sure I could have said that better... Hope it makes sense to you)
Personally, if the choice is no identifier, or one that obscures part of the list, then I'd choose no identifier...
How about this?
Put the library identifier in the field where setlist and collection identifiers appear, BUT replace the library identifier when a set list or collection is selected.
In addition, if you're going to go to the trouble to write code to only show the overflow menu option to change libraries when additional libraries exist, why not reuse that code to only put the library identifier there under the same conditions.
(I'm sure I could have said that better... Hope it makes sense to you)
You're only paranoid if you're wrong 
I'm using an Onyx Boox Tab X, and play low brass: mainly 'Bone and Tuba
I'm using an Onyx Boox Tab X, and play low brass: mainly 'Bone and Tuba