Website and Mobile

I’m still learning bubble and need advice on the following question.

Currently I’m in the process of building a website in bubble, which when the user signs up they access specific parts of the website.
Within this I’m building it to work on a mobile and to have specific access which isn’t available on the website version.

To do this, which way would I create the frontend UI. I’ve done a diagram to try and explain

My suggestion would be to opt for the “website and mobile together approach,” where you can leverage the “current page width” information to manage how user navigates. This approach not only simplifies your application but also allows you to effortlessly incorporate the same functionality on your website later if you feel.