HI
I use 4 buttons assigned for this …it mimics the zoom in out buttons on a Mackie MCU Pro controller
two next to each other, one zooms horizontally in the other zooms out
two above/blow each other which zoom in / out vertically.
I
vert in
horiz in horiz out
vert out
just tap as many increments as you need.
Being able to assign buttons to any keyboard command is incredibly powerful. I couldn’t live without it!