Hi Paul
Thanks again for Helping. I wanted to reproduce the Layout Problem. So i had another Test-Installation. First I Updated From Pagebuilder Version 2.7.1 to 2.7.4. I had the following DB Error:
The Layout was still OK. But the SP Pagebuilder doesn't worked proberly and i had this strange Phenomenon.

After installing the New Version SP Pagebuilder 3.7.9 i had the Lost Joomla Integration as i described in the Begining, and the Fluid Layout was Lost. And yes, these are lot of Pages to control.
So i can set "Fluid Row" in hundreds of Row Settings.
Maybe you have another Solution?
Then, another Layout Problem:
If I have a little more text in the third column, then suddenly there is a gap to the image in the first column. How can I avoid this?

Best regards
Christoph