The App Settings page lets you customize your app's post-installation behavior, both for the app in general and for specific extensions.
When a Wix user installs your app, the page that they're directed to by default to depends on your app's extensions:
In the Post-installation navigation section, you can change the default behavior. If you've added one or more dashboard page extensions, you can choose to direct Wix users to one of these pages.
In addition to navigation, you can configure post-installation behavior for specific extensions. For example, you can choose to add a site widget to a site page upon installation, instead of requiring the Wix user to add the widget themselves.
The Extension installation behavior section directs you to the Extensions page in the app dashboard, where you can configure specific behavior for each extension.