Audience control lets one select the audience that will see an individual Action. Said differently, it sets the context in which an action will be visible. For example, an Action may be visible only to users that have installed an app.
The Audience control icon for an Action will be highlighted green if selections have been made.
With the above settings, the corresponding Action would be visible only to Android users who have installed the App.
For another common use case, one can add an Action that will be visible only to users that have entered the App's security passcode. Depending on the security configuration, other users can see all Actions other than those with the "Secure" Audience setting.
Similarly, one can have an action that is visible only to desktop users. For example, if the goal is to get a user to install an app on their mobile device, then a desktop user should see an Action with a visible QR code they can scan with their mobile device to get the app.
"Both” is the default audience for each audience category.
When building or updating an app, the dashboard preview has a selectable filter that enables one to toggle between different audience views. For example the below filter will show what content a mobile user will see if they are browsing the App. Desktop users or users that add the App to their home screen can see different content, but one can easily preview their experience by adjusting the filter.