I´m trying to work with a Grid, but....?

I tryed to use a Grid in Elements. I set 3 columns. That is the result…

Bildschirmfoto 2025-09-22 um 16.59.28

I only can put an item (container, image, text) in the first column. It is not possible to do any item in the other 3 columns! What mistake i’am making?

Sorry, I set 4 columns!

take a look here:

or

Ok, thanks, i have it now?