I appreciate that you cannot delete users from Umbraco in the true sense of the word due to referential integrity within the SQL database should there be any nodes associated with them
I have a database that has had several dev/test users created over time and I need to deliver the database to a client.
If I disable a user (selecting both "Disable user" and "Disable Umbraco Access"), how can I stop them appearing in the list of users in the backend? I do not mind them remaining dormant in the database but do not want the client (who will be logging on as an Admin) see them
You can update a setting in the ~/config/umbracoSettings.config file.
<security>
<!-- change in 4.8: Disabled users are now showed dimmed and last in the tree. If you prefer not to display them set this to true -->
<hideDisabledUsersInBackoffice>true</hideDisabledUsersInBackoffice>
</security>
This setting was introduced in v4.8. If it's set to true it's not possible to see disabled users, which means it's not possible to re-enable their access to the back office again. It also means you can't create an identical username if the user was disabled by a mistake.
Source: https://our.umbraco.org/documentation/reference/config/umbracosettings/#security