Can't see the Collections field in Products database

I didn’t find any solution so I decided to create my own database. But I find out I can’t see the “multi-reference” fields generally. I created a multi-reference field connected to Products database (auto created by Wix) and when I check the results I don’t see it on the console log or at the backend tests:

Database:

Then I created a different multi-reference field and I didn’t connect it to the Products database I connect it to the “Posts” database (auto-created by Wix when you add Wix Forum)

And what I see is it’s working and I can see it on the console log.

So I guess I can’t see a multi-reference field connected to Products or what? I don’t understand why we can’t see this??!