When adding a new screen to a canvas app, you can select the screen "Scrollable". This is a unique screen because of the "Canvas" control. You can add sections (data cards) to it and sections can have different controls and height.
The "Canvas" control is useful for screens where the total amount of content/functionality is higher than the screen height and there are a fixed number of sections.
You can only add a new section add the bottom of the "Canvas" control. So what to do when you want to change the order of the sections?
Each section has an "Y" property, and it is this property that controls the order instead of being the Y-position on the screen.