how to UN-share

I shared my mockup. Now I want to UN-share it so the people I invited can't use the link anymore.

Apparently I'm the first person to EVER want to do this and it's a really stupid idea because there's NO information about how to do that. Oh but wait, there's a thread for this - people have been trying to delete links for YEARS, there just doesn't seem to be a way. How clever. 

What do I have to do, make a local copy, delete the one in my adobe cloud, and then unplug my internet and turn off the main breaker at my house?

When I do what I think might delete the link, it shows ALL the files, not just ones I've shared links to. That tells me that when I click delete, I'll delete the actual file, not the link.

When I use the link myself, the mockup has links to EVERY file in my adobe cloud. Do the people I've shared the one mockup with also see all my files now? By sharing from within the one Xd mockup I've been working on, did I just share every file I've ever created in any adobe software? Sure seems like it.

Why is there no simple way to just delete the damn link? How is it that the simplest most obvious things a user (i.e. ME) would want to do are simply not there, or bizzarely hidden? Does anyone at adobe ever think about how actual people might actually use the software in the real world?

WHERE'S THE LINK? HOW DO I GET TO IT? HOW DO I MAKE IT STOP?

Somebody's really stupid around here, and it better be me because this is seriously annoying.