Need some help figuring out edge://sync-internals/

I'm looking for a documentation to explain things that are shown in edge://sync-internals/

I found some info on Chromium Github page but it wasn't enough, so is there a better documentation somewhere or can anyone just explain it here?

I'm trying to understand:

• the difference between total and live entries
• the meaning of group type and why does it say non blocking
• where there is always 3 bookmarks left even when I have deleted all of the bookmarks/favorites in Edge.

Thanks in advance