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The Return Ad is a new ad unit which is displayed once the user returns to your application after a certain period of time. To minimize the intrusiveness, short time periods are ignored. For example, the Return Ad won't be displayed if the user leaves your application to take a short phone call before returning.
Return ads are enabled and activated by default. If you want to disable this feature, simply pass "false" as the 3th parameter of the
StartAppSDK.init(this, "Your App ID", false);