No elements visible

[sapvi]

Hi all again, honestly I am very frustrated by my first experience with Qt Design Studio, it seems extremely unintuitive at least in its current version.

I was working on my main qml, let's say Screen.qml. I wanted to add an option to press some button and open e.g. the Settings popup dialog, or some other additional window. However, I cannot find the proper way to do it in Design Studio, not in just Qt. How should I do it?

I tried to make a new file, let's say Settings.qml, but I cannot seem to visualize any objects I add there! I dragged and dropped there Column & Rectangle, both marked as "Visible", yet they cannot be shown in this new qml file. Also, sometimes I can resize the objects directly by clicking and resizing them, sometimes no, in 5 hours of using Qt Design Studio I have not figured out to what it is related, because it just seems to sometimes randomly work and sometimes no.

1. Should I make a new qml file for such popup or not? What if it is not a small settings dialog but actual completely different screen?
2. How to connect those in Qt Design Studio by pressing a button?
3. Why my objects are invisible in new qml file?
4. Why I cannot even more/resize them sometimes?

Thanks!