How do I switch a screen in the designer page without doing the whole thing again?

[gordonlu310]

Copy a Screen within MIT App Inventor

This tutorial will show you how to copy a screen in MIT App Inventor. This is useful when you need to have similar screens in your app. The same thing applies to duplicating blocks or components in your project. Go to the screen that you want to copy. Select the screen in the Components list, which is betweeen the Viewer and Properties. Hit the 'Copy' combination on your PC (for example, Windows is Ctrl+C) Create a new screen. Your copied components will place here. Hit the 'Paste…

Also see:

How can we rename screens other than Screen1?

Screen1 is undeletable. You have to shift it to something like this. And copy the screen to a screen that has your wanted name via