Common use case for crossdocs is to share select data externally - no need for external users to access source doc. I understand they are denied access to source doc if they click it, but it’s a needless distraction. Toggle to show/hide that link would improve UX.
Hi! I once thought about this problem too, and I found a solution in the form of publishing a doc url.
in which case you can’t see the crossdoc panel.
I hope this helps you.