Hi Shivam,
Thank you for getting back to us. Please do note that this behavior has been raised by other publishers as well. The team mentioned that, the GMA SDK attempts to hide the status bar when full screen ads are presented, but sometimes the way a publisher is implementing their view controller's prevents us from doing so. It's difficult to explain the exact cause without seeing the publisher's app, but basically, when a view controller is presented modally, the view controller on top is supposed to be able to control the status bar's presentation state. It's also possible to present a view controller as a "child" of another view controller, though, and in that case control of the status bar stays with the parent view controller. If our ads are presented from a child's stack, we can't hide the status bar.
In addition to that, Apple provides APIs that allow parent view controllers to hand off status bar control to children. You can verify your implementation and consider implementing an API like this in your app to make sure GMA's ads can control the status bar.
Regards,