Hi @wonka1234, 😊
Although you can create galleries that exceed the screen view width by using containers to delegate the scroll functionality to, you will not be able to drag & drop controls past that initial screen size point. In order to add additional columns to the right, you will have to use dynamic X values.
Let's say your last control on the right side is Label1. Should you want to add another label (called Label2) to the right set that label's X property to:
Label1.X + Label1.Width
The next label would then use Label2.X + Label2.Width and so on...
Alternatively, you can use a Horizontal container within the gallery, add your labels within that container set the container Width to Parent.Width.
If this solves your question, would you be so kind as to accept it as a solution & give it a thumbs up.
Thanks!