Public app sharing is currently available only on the classic apps at the moment. We appreciate your interest as we are working on making the feature available for the new app builder!
Feel free to drop a +1 on this thread - we're actively collecting feedback to help prioritize this feature!
You can also select the "Watching" option to keep informed of any updates in this thread:
-Jen
This will be a big win for our internal customers. They often only need to use a specific feature/module that we would love to be able to embed in our intranet/hub sites.
Echoing others, as an Enterprise Retool user, I see huge potential in the new App Builder - I’ve already managed to rapidly create some incredible forms/wizards that otherwise would have taken me hours (if not days) to setup in Classic Builder. But, these forms/apps are currently useless until I can share them via a public URL with non-retool and non-organizational users 
