$100,101, and 102 are how many steps the motor takes to move 1 mm of travel. That is what you set to go a defined distance. If you are using the standard belt that came with the x carve, I would set the controller settings as the x controller says and calculate what you need to achieve the accuracy you need for moving an inch or CM. The length of your Y axis doesn’t impact this number. If you measure with an accurate scale, it’s not too hard to do. $131 would have to be adjusted for a longer extrusion. I’ve been doing this a lot lately.
This is what each of those things do in $$. I printed it out and have it next to me when you are making adjustments to the software.
Here are some default settings: