Usually the kickboard is held in place with push-on clips onto the front adjustable legs, remove the kickboard, raise all 4 legs on each unit, and push the kickboard back on.
You are probably going to encounter problems though.
The units will probably be screwed together, raising them will be difficult unless you separate them first.
You might also have complications with plumbing and / or gas if you have a sink / hob or any other appliances in or above the units you are raising.
If you get around any problems and raise the units, there will now be a gap between the kickboard and the units, so a taller kickboard might be needed if the gap is visible.