I want an option in the app that allows me to expose only part of the app to a potential customer. After they subscribe, they will be able to access everything. Is there such an option?*
Yes, sure.
You can work on in-app subscription and only entitled users can see.
Docs are here to start with, but altough the documentation is clear and it’s a step-by-step guide, it requires a lot of patience, tests and Thunkable knowledge
Good luck!