You can also get there this way:
- open sidebar
- click more…
- click groups
- change filter to “groups I own”
That’ll take you to a page with a URL like this: https://meta.discourse.org/g?type=owner
You could lift the groups page outside of the “more…” menu to make that a bit more discoverable if it’s a location people will need to frequent, and/or suggest that group owners bookmark the link filtered down to owners for themselves.