DTTG share sheet tag autocomplete

Am I wrong in remembering that in DTTG3, when sharing a doc using the share sheet and choosing DTTG, typing a few letters in the tag field would suggest existing tags to autocomplete?
Is this possible in DTTG4 (latest versions of app and iOS) or is it a toggle somewhere?

Yes, it’s possible and it’s working here.
Does it persist after a reboot?