OnePlus 9 - Sound & Vibration; Volume

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 Accent color: Click the color you want and
save to change the accent color, also you can
customize the accent color by click the
“Customization” button.
 System icons: Customize the status icon
shape, there are four shapes available, Round,
Square, Teardrop, Round rectangle.
 Icon pack: Two sets of App icons are
available: Oxygen and Hydrogen. And more
options to download from Google Play by
tapping the shopping bag icon.
 Font: There are 2 kinds of font available,
Roboto, OnePlus Sans™.
Sound & vibration
Go to Settings > Sound & Vibration to change
the sound settings on your device.
Volume
 Ring & notification volume: Adjust the
slider to set the ringtone volume for phone
calls and notifications.
 Media volume: Adjust the slider to set the
volume for playing music, video and more.
 Alarm volume: Adjust the slider to set the
ringtone volume for alarms.