When do we use desktop and when to use screen

Hi,

Is there a good guide to explain the higherachy of UI containers.. such as desktop, screen and others..

Where to we put header and fotters.. (assuming that it should be in desktop)

The desktop is the unique root widget in Kuix. You can't remove it and you can instantiate it. It can only contain a Screen a child.

A Screen is the first widget that you use to display some other widgets. It implements a TopBar (for title) and a BottomBar (for softkeys menus). You can add what you want as a child of a screen.