User and Groups Permissions grayed out

[TSSIn]

I saved an access MDB as an ACCDB and now the Users and Groups Permissions option in the ribbon is grayed out. How can I enable this to view User and Groups Permissions.

[June7]

Review https://support.microsoft.com/en-us/...5-fb923ffb9fa3

Note: Do not convert your database to one of the new file formats if you want to continue using user-level security. The user-level security features work only in databases that use an earlier Access file format, such as .mdb files.