(um.... I don't think I will be concise ?)
When you open B4A (or the other b4x RAD tools), you must save the new project before you can do (almost) anything; good thing.
To save the project, you need to name the project and select where to save. Obviously, always or almost always, you will first create a folder for the new project; furthermore, "you must" set a package name (unless you use the default one, "b4a.example", which is only useful for testing).
It would be nice if the IDE does this automatically (leaving the programmer the ability to do everything manually).
The "New project" menu icon
should
only ask you for the name of the new project and the directory that will contain the project folder, which will be automatically created by the IDE.
Even the package name automatically created (maybe you can set somewhere your "base part" as setting, like: "com.b4x" and "com.b4x.mybeautifulnewproject" will be created).