So I just bought a OnePlus 12 recently, I was used to controlling volume using the onehand operations goodlock module in my Samsung galaxy S23. I basically never had to press the volume buttons to control the volume unless absolutely necessary.
Possible ways I’ve thought of (it would be really great if at all possible) -
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Using the curved edges in phone screen for volume control.
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Using the gestures to control volume when the screen is off.
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Setting Diagonal swiping gestures to do different functions, controlling volume in this case.
There is. I use an app called Software volume button
You can add the app to the sidebar for quick access and change the volume seamlessly.