I found the group. It's in DRAFT_GRP layer in the layer tree. The groups seem to be named ID0(DRAFT GROUP), ID1(DRAFT GROUP) and so on. The name you enter when creating the group I found in the DRAFT_GRP layer properties, click on the 'Info...' button.
I've never used Pro/Toolkit so I can't...
I've never used this function so I have no idea where the name is saved, but you're probably right. Layers seems like the place. I usually only use "relate to view" for notes without attachments.