Yes. Handlebar height can generally be adjusted by changing the arrangement or number of headset spacers, provided the final setup remains within the approved spacer range for the frame, fork, and cockpit.
The available adjustment depends on the remaining steerer-tube length. If the steerer tube has already been cut, upward adjustment may be limited. Never exceed the maximum spacer allowance or make unsupported changes to a carbon steerer assembly.
Consult the model-specific service manual or an authorized X-LAB dealer before changing the spacer configuration. After adjustment, the headset, compression hardware, and cockpit fasteners must be installed and tightened correctly before the bicycle is ridden.