So exploring the new 7.1 stuff, and while more direct access to the patterns and such is nice, the confusing and concerning part is this new "design" option on the right when you first click the "edit site" and get options to move your template blocks around.

That design section seems to have some default new patterns that aren't part of the theme I'm testing with, and it's unclear if these would edit the core theme templates, or just provide another option?

I can't find any documentation on these, on either how to add to them or remove this entirely so some user doesn't torch the theme for all other uses on our multi-site instance.

Anyone found info on this?