erm…..yes&no.
They should (well mine do) come up on their own when you up the travel, but you need to push down to reduce the travel. You may well find that as their new they have a bit of stiction so need a little encouragement at first – you probably won't know until you've had a decent ride on them.
The travel adjust basically works on a small additional air chamber that is under high pressure, so as you turn the dial the chamber enlarges and the pressure ups the travel (pressure is highest and travel will change quicker from 100-120, than 120-140 (but not by much).