Yes, you see the current level of all pedal controllers on that page "Pedal Links" and you can simulate to adjust those manually using the four soft knobs.
If you are using an expression pedal configured as Wah Pedal to also control volume opportunistically ("WahPedal to Volume"), the bar for Volume Pedal will follow the bar for Wah Pedal while no wah effect is activated. As soon as a wah effect gets activated OR you load another Rig with an active wah effect, the bar for Volume Pedal will rest in its last position and the Wah Pedal will control just the wah effect. You don't want the volume to fluctuate while you control your wah effect. So, in this phase you have no pedal to adjust volume, which is the natural downside of sharing one pedal for both purposes! As soon as you disable the wah effect or load another Rig without an active wah effect, the bar for volume pedal will follow the bar for Wah Pedal again. Both the level of the Wah Pedal bar and the level of the Volume Pedal bar survive a Rig change. There is one exception: If the bar for Volume Pedal is very low and you activate a wah effect or load another Rig with an active wah effect, the software automatically raises the Volume Pedal bar to about 25 % assuming you don't intend to enjoy your wah effect at extremely low or even no volume AND having no pedal available to raise the volume. Therefor it performs an automatic intervention.
I suggest, you simulate moving the Wah Pedal with soft knob 2 on page "Pedal Links" and observe what happens with the Volume Pedal bar in the various scenarios in order to internalize the mechanics. You might also observe, that the bar for Volume Pedal follows the bar for Wah Pedal in a smooth way closing gaps softly and avoiding jumps.