The 3677 value on the left is the current position. The 0 on the right is where you manually enter where you want to move when you hit the play button next to it. Doing so will drive the motor in, then it will read 0 on the left.

Elsewhere under mechanics, you can set the initial step size. This is used my the autofocus algorithm. But it is also how far it will focus in/out with the arrow buttons above.

Lastly if you want to set the current position to a custom value without moving the focuser. Use the Sync box in the INDI diver itself.

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