Start by selecting a Product Group from the menu on the left side of the screen.

Some of them, e.g. Louvers, have multiple Product Types, which will be presented as a group of buttons, as shown in the illustration to the right. This will not appear if there is only one Product Type, e.g. Sunshades.

You can use the Document Type selectors to limit the list to a single document type, e.g. Submittals