The CR-20 Pro has solid bed mounts. If any X axis gantry alignment is needed, you can use the "nozzle to bed" distance to check.

With M2.5 hex, loosen the 2 button head screws on the back side/ right of the X/Z Bracket.

If the right side is too low and needs to go up, squeeze the bracket and rail together while tightening the button head screws.

When properly adjusted, the nozzle will be the same distance from the bed from left to right.