https://www.spath-schuetzen.de/de/gasthof.html here the header image. so im exited to see how you solve that.
Hi.
I do not understand what you expect as a solution. Perhaps you poorly explained your problem initially. This link finally confused me. The Image addon and custom css is used there.

If you want get the same but with using bg image instead of Image addon, use column settings

In version 3.8 was the same, and even less - there were no settings of the column height.
And it is when using the background image in the column settings that the "fluid-row" option in parent section works as you described above. There have never been options for a container.
Here is

Or, please be more clear.