This is what I have in mind. Sometimes we would like to make some screen and like to include in in our some of other screens. Now, instead of re-create screens and copy paste, is this something possible?
You can extract your reusable screen parts as a Frames - https://doc.cuba-platform.com/manual-6.5/frame.html Create it from Studio Screen Designer: Generic UI - New Screen - Blank Screen. Then open Properties tab and change “Controller Extends” to AbstractFrame.
After that you will be able to add Frame UI component and specify your frame id in its screen property.