The jumpers are determined by the step you are wanting.
"Six different step resolutions: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step"

DRV8825 Stepper Motor Driver Carrier, High Current
Old version: md20a: https://www.pololu.com/product/2132
New version: md20b: https://www.pololu.com/product/2133

https://www.instructables.com/Instal...epper-Drivers/