This is the new volume indicator in iOS 13

iOS 13 finally includes a redesigned volume HUD. The new volume slider is on the left side of the screen, where the volume increase and decrease buttons are located. It first appears as a large bulbous slider, then is reduced to a more discreet thin line.

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The HUD volume had become the target of many jokes in the iOS community, the old interface being a large square area covering the center of the screen. The new look is smaller and is reduced to an even smaller presentation after a while.

The new user interface is interactable. In addition to the volume buttons, once the volume palette is visible, you can drag it up and down with your finger, just like the slider in the Control Center.

When the phone is in landscape mode, the volume slider appears in the middle of the top of the screen.