Hey @userIRGjNvOd3J, I hope you're doing well. Have you tried rebooting the device to see if that'll remove that unused space? You can also try removing and re-adding the media and devices buttons by pulling down your quick settings>menu>Quick panel layout>Show devices and media buttons.
Hopefully toggling the buttons will resolve the issue along with a reboot.
Please let me know if this helped out in any way.
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Same problem here. This seems to be where the media controls should show up but when there is no media playing the space is left with nothing showing. This appears to be a bug in the OS. Please fix it. Also, rebooting the device does NOT resolve the issue.