The grid
You can see the grid values in your URL, this is the same for all glyphs in your F%NT.
By default :
https://f-nt.eu/font/start#125-125-125-125-125-125-125-125-125-125_125-125-125-125-125-125-125-125-125-125-125-125
#125-125-125-125-125-125-125-125-125-125 for 10 columns
_125-125-125-125-125-125-125-125-125-125-125-125 and 12 rows
Remember : You can drag the line by clicking the % button.
Functions
In the three dots menu, there is a command line tools $_ to launch functions (press enter to execute)

resetGrid() to reset ;¬)
stepsGrid to create grid with proportion.
easeGrid('circ.inOut','circ.inOut') to use math from GSAP.
You can change arguments !
example : stepsGrid('2,2,3','1,5,2')