How do you reorder Screens in App Lab

[Posts in the debugging category need to have the following pieces of information included in order to help other teachers or our moderator team best help you. Feel free to delete everything in brackets before posting your request for debugging help.]

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.
Link to the project or level: [replace with link to the curriculum or get the “Share” link to a project]
What I expect to happen: [replace with a detailed description of the behavior you’re trying to create]
What actually happens: [replace with a detailed description of what actually happens when the code runs including any errors or unexpected behavior]
What I’ve tried: [replace with a detailed description of what you’ve already tried to do to solve the problem]

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.