I am working on a new project in V14. This project is not on line yet.

I started with creating the header for all the responsive resolutions. Not all of them can be exactly the same. But while I was working on the rest of the project, I wanted to make a few changes in the header of the smaller resolutions. But when I try to change an object in the header of one resolution (it does not matter which resolution), the program automatically changes the same object in all the other resolutions. This happens not only with the objects, but also with the menu. So I can not create different headers for the different resolutions.

Can someone tell me, what am I doing wrong?