The default of the Navbar component setting under "Expanded" is "Always". My suggestion is that it should be "After MD" by default, which is the default setting for "Navigation Clean". I am not sure if this should be considered a bug or a feature request, but either way, it would be great if you could look into this.
Thank you for the suggestion! This makes a lot of sense. We changed the default to be "After MD" by default. This will be released as part of Bootstrap Studio 4.0.3.