We can add "Tags" to OpenPGP keys when certifying public keys. This remarks feature is very useful for institutions to group public keys by project or by country etc.
Kleopatras file encryption dialog does not properly support that. Neither through autocompletion nor when opening the dialog in a different window.
At least when the dialog is opened they should be listed / loaded if kleopatra has been run long enough for the keycache to populate them.
This is part of improved support for grouping but unrelated to the other group settings.