[Zubersoft]

Any filter that is set in the group editor is a temporary thing that will be cleared when you leave the group editor unless you uncheck Settings->Library Settings->Reset Filters After Exiting Group Editor. Then any filter change you make will remain when you return to the library screen. I'm guessing that's the problem here, but if it's not, I'm going to need more information on how you are generating the collection, as there are many different ways to go about doing that. Also, please be aware that filters are not set per-group. The filter is applied to every tab on the library screen and to whatever group is currently selected on a group tab. These filters are cleared if you restart the app unless you enable the option to automatically load last used filters at startup.

Mike