Where did the pressure advance option go? It got cut from the slicer settings 
Donāt think Bambu Studio ever had it.
Use Orca-Slicer
Before you had the enable presure advance checkbox and setting under the temperature settings screen
I believe you must have been using Orca Slicer:
No hits for āenable pressure advanceā in the Bambu Studio git repo
To be honest i cant seem to find it back aswell 
So it seems all this time i saved the pressure advance, to slice afterwards in the original bls.
It probably didnt use the calibrated setting too.
Must have been real lucky with quality
If we cannot modify the pressre advanceā¦ how we should work? we only need to enable the auto flow calibration? if it is? how can I make the volumetric speed test if when I make it, it is auto calibrating the flow?