From the first sub-section of the general settings you can rename your project, change the framework and select the main component (meaning the page that will act as the home page of your app).
In the second sub-section you can enter your environment variables (as you would in an .env file.
In the rest of the fields you have the option to manipulate the "App" file of your application by adding imports, code and providers.
Web
Project settings - Web
From the first sub-section of the web settings you can change the "title" of your pages, you can select if you want your app to be a PWA and optionally select an authentication provider.
In the second and third sub-sections you can connect respectively your Axiom and Sentry credentials to use them for logging in your project.
In the last sub-section your can add custom head entries to include in all your generated pages' html code.
Mobile
Project settings - Mobile
In the mobile settings you can edit various settings for the display of your application on a mobile device, including the app name and the icon.
You can also customize the text displayed when permissions are asked from the user, such as permission to access the camera of the phone.
If you want to use Expo to preview your application when building with the platform, you will have to enter your Expo and Apple credentials. More on how to do that on: