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.
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.
Workspace restrictions do not affect the visibility of published settings such as service items or solution articles. Visibility is managed separately through the visibility settings.