Hide assignment status

If you would like to assign entries to particular users to ensure that they only have the necessary access rights to a select amount of entries, a good way to hide this assignment is to use the form rules, especially if the assignments are made by a particular admin, or to prevent users to accidentally change the assignment.

Leaving the form rule condition blank in this example ensures that the Select User field used for the assignment is hidden when a user is already assigned to a record.