When creating a resource or when adding new fields to an existing resource, you can define how you want them to appear in the interface.
This step is not mandatory as you will still be able to populate your resource and access its data through workflows, audiences and REST API.
If you want your resource to have a dedicated screen, you can make it available from the navigation menu.
The List configuration section of the screen definition lets you define the columns and information that will be diplayed by default in the overview of a resource.
The Detail screen configuration section of the screen definition lets you define the columns and information that will be diplayed detail screen of each element of the resource.
These settings allow you to display a control bar in the custom resource screen. There are three options available: