@stormi Yes, it's present in both. That's what drew me to the 8.0.1 release - I hopping this was fixed from version 8.
I will go ahead and open an issue on github.

@stormi Thank you for looking into this issue.

I'm running Windows 10 Pro 1809, OS Build 17763.593.
I have DotNET 4.7.2 installed.

Is there any additional information I can provide that would be useful?

Thank you, that's helpful. Open-source support at its finest.

EDIT:
Not the only person reporting this issue:
https://xcp-ng.org/forum/topic/1384/xcp-ng-center-8-0-0-bouton-edit-memory

The "Edit..." button is still missing from the Memory tab on VM's:

v.7.6.3:

v.8.0.0 and v.8.0.1: