How do you reorder Screens in App Lab

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I would like to be able to get the Red/Yellow Welcome screen to appear first when Run is initiated.
Right now, the app begins on the green Choices screen.
I have tried placing the OnEvent blocks for that screen in different places, but it still defaults to Choices.
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You can choose which screen shows up first in design mode. Select the screen you want first. At the bottom of the details there is a Make Default button. That sets it up to be first.

You are so kind to answer.

Thank you.

Dina