Any Apex Central user account that has permission to create or modify custom tags, filters, or important labels in the User/Endpoint Directory can view or modify custom tags, filters, or important labels created by all other user accounts.
Editing a tag, filter, or importance label on the User/Endpoint Directory screen also modifies the corresponding tag, filter, or importance label used by log queries and reports. For example, if the an endpoint is removed from a custom filter on the User/Endpoint Directory screen, then log queries and generated reports that use the filter will exclude data from the removed endpoint.
Click the user/endpoint row and click Tasks > Assign/Remove Custom Tags.
Right-click the user/endpoint row and click Assign/Remove Custom Tags.
You can verify the proper association of tags with the selected users or endpoints by selecting a tag from the Customs Tags list, and checking that the selected user or endpoint displays properly.