Fields included in multifields should list said multifields under Used By
The tab Used By under a field only lists the templates that it included in, but not if it is included in multifields. The used by tab should also include which multifields the field is used in.
A bug for this was shipped in 8.16.
Hi,
we have created bug 68160 for this. We will remove this idea. Please follow the bug in the Docs site.