Intune Windows App (Win32) Applications Panel

On the Intune Windows Applications (Win32) panel of the New Catalog Item Wizard, which opens if you select Intune and then Windows App (Win32) on the Software Source panel, you select the Windows App (Win32) application that you want to add to this catalog item.

Therefore, to search the entire Intune instance for a specific application, you need to use the App ID, Display Name, Publisher, and Owner column filters.

Click on the application that you want to associate with this catalog item and click Next.