Hi Bob,
please press Direct Access button and then press/move the Pedal slighly to call up the Assignable display.
Make sure to have ticked only the Parts that you want to be controlled by the Volume Pedal. Close the Assignable display.
If you work always with the same Pedal settings, you could tick "Pedal" in the "Parameter Lock" display.
Edit: Unforunately, I was wrong here: There is no "Pedal" parameter in "Parameter Lock". But you can use the "Freeze" function to prevent the current Pedal settings from accidentally changes by (unknown) Registrations:
Press the Direct Access button and then the Freeze button to call up the Freeze settings. Make sure to have ticked "Pedal" here, then close the Freeze settings display. Now, when "Freeze" is active (LED lights up) the current Pedal settings are locked.
Note that otherwise the Pedal settings could accidentally changed by Registrations. So save your Pedal settings in at least one (setup) Registration.
Hope this helps!
Best regards,
Chris