Clicking on the App Listing menu and choose Apps to show all available apps for the current Site. They can be default apps, apps purchased through the Appstore or apps developed by you. Non-default apps can be activated or deactivated using the Activate/Deactivate button. Activated apps can be configured using the Configure button, this allows custom configuration for each Site. Apps developed by you can be edited, listed on the Appstore or deleted.
Apps may have custom configuration to store settings for each Site. Click on the Configure button to show available configuration fields and use it to set values for your Site. Additionally, App can be customized to fit your Site using Custom Fields, SubApps and Automation Actions. Please refer to the related documents to learn more about them.