Note: Applicable only for accounts in which workspaces have been enabled.
You can restrict a workspace to only the agents/admins explicitly added to the workspace to protect sensitive employee data. Even account-wide admins will not be able to administer restricted workspaces unless they’re explicitly added as admins within those workspaces.
Go to Workspace settings > Your workspace > More options () > Convert to restricted workspace > Click on Proceed.
Please note: The workspace should have at least one workspace admin to be converted to a restricted workspace, as the account admins won't be able to access the workspace after the workspaces have been restricted.