Hello friends, this post is a continuation of this other...
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Sometimes we make an application with several Screens, as we look in this example:

Later we want to put a menu and that is in Screen1, since the application always starts on Screen1.
For this we can create another application where only the menu is:

Then through A2Merger Tool we can merger the two applications.

Pressing the button "Merger" will indicate that Screen1 already exists, at that moment we change the name as shown in the following image ...

- Download: https://github.com/josmas/app-inventor/tree/master/appinventor/aimerger (Version v1.2)
- Example in Spanish: http://kio4.com/appinventor/127K_poner_Screen1_menu.htm
Regards.