While it is simplest to import a standard template, in reality there are a lot of custom Notes and Domino application out there. This is where the custom template comes in handy.
When you first open your imported database, select "Custom" from the Templates list and then save the settings. You will be presented with a list of all of the different types of documents in the database, each different type can then be configured.
Depending on the settings of each collection, they will be shown in the main section or the "Hidden Collections" section of the home page for the database.