Have some folders excluded from playing all or all new. Tap Everything should play all recordings except the ones in excluded folders. Sort of black listed folders
Please update the recorder in the AppStore to get ability to Include or Exclude folders from shuffle. Just swipe on a folder and tap More to access the folder menu.
Another vote or include/exclude. Hide/Unhide would be less helpful; for me it's not a matter of wanting to forget those recordings exist, it's more not wanting to bump into them unless I mean to listen to them. Gassho.
I vote for include/exclude