Apple is updating iOS 11 with a less intrusive Volume HUD.
Previously, when adjusting volume levels, a large overlay appeared in the center of the screen blocking content. Now, a smaller, less intrusive overlay appears at the top right of the display.
While the new HUD hasn't made it everywhere yet, presumably it will by the time iOS 11 is released this fall.
Take a look at the screenshots below for a comparison. You can follow iClarified on Twitter, Facebook, or RSS for more iOS 11 updates.
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There was never a volume HUD on any iOS that put it down on the bottom. You are fake news. Only time you could do that was with CustomHUD on a jailbroken device..