Voltage zoom/scale problem...

Im very impressed abou DSO Quad.... I test him about few days and lot of functions I guess without manual but I cant find Y/Voltage scale/zoom in saved wave.
I can change X/time scale and lenght wave but I can`t change Y scale to zoom in/out wave.

Please help

Thx a lot


Please follow the instruction, Y axis doesn’t support Zoom in/out. Thanks!