CMS still locked after removing collection links

I am trying to change collection source, i have removed all connections and now its locked as “none”.

What else can I do to unlock ?

Here is my public share link: Portfolio - Orchid Homes

Read only link:
Webflow - Orchid-Homes

i ended up just duplicating the section and adding a new CMS block and redid it … still not sure why it was locked to “none” …