Upfront and Pro Sites

I am using Pro Sites for my main website and while it was working perfectly with Layers & Pluto theme, which btw is third party, it is not working with upfront.

Forget working, it is not even appearing within the site design:

What to do? As in this is a deal breaker. After spending 2 days trying to get upfront to work with my sites and getting workarounds for all the bugs, this is seriously disheartening.