Why i could see the menu to change the version of android of the app only in one of my projects

Hello, recently, editing a project i've noticed that App Invetor now let you modify the version of andoid you want on your app. Then, since i liked the idea of a new style for my apps, i have opened another project but there wasn't the function to switch the version of android. Is there a way to enable this menu ?
Thank You all.
First project where i could see the menu
Screenshot 2024-04-15 161247
Second project where i could not see the menu
Screenshot 2024-04-15 161431

If you set the Theme to other than Classic:

you can see this menus:
image