stepper motor minpulse width

Hello.
I'm making an OAT.
The firmware is up to date on the MKS Gen L V2.1 board.
I'm going to use the motor as the Close loop motor I had.
It works with the same input as A4988.
So I tested it, but it didn't move, so I checked it.
Result. Minimum pulse width is too small to be recognized.
I tried to modify the source, but I don't know where to modify it.

Thank you for your help.