To display or manage data in the portal, you only to need to specify the entity in the CDS. To show a list of records, you select the entity and then a public view for that entity. You can choose to add the create, edit, and delete options, as shown in the following screenshot:

To create or edit a record, you need to create a web form by selecting the entity, a system form, and select the edit mode, as shown in the following screenshot:
The portal app inherits its list and form layouts from the views and forms in the CDS. To change which fields are included in the portal lists and forms, you need to customize the view and forms for the entities in the Power Apps maker portal.
Portal apps allow for simple addition of pages...