Is there a way to remap the volume buttons? When holding the device in portrait mode the volume up button is actually volume down and pressing volume down turns the volume up.
You can use PowerToys but it has to be running in the background for remapped keys to be functional.
The only solution is to edit the registry to remap the sidebuttons.
The buttons now are just like the surface pro and other tablets.
In portrait mode: Top volume button becomes volume up and bottom button becomes volume down.
Note: This works for my US English Keyboard layout. Other layouts you may use at your own risk.