Lightweight vault and password manager for Android, KeePassDX allows editing encrypted data in a single file in KeePass format and fill in the forms in a secure way.
I guess you didn't enable groups & tags earlier by default for older versions of database formats... What if the user using an older version of KDBX that doesn't support those? Simply ignore such advanced field?
Is your feature request related to a problem? Please describe. Enable default Tag search without using search settings