They should just rotate when you slacken them off.
Some roadbikes however, have a hole in the handlebar and a pimple on the switchgear/throttle to stop it rotating. When I changed the bars on mine, I just filed off the pimple and have had no probs in 8 years.
On off-road bikes, most of us leave all the bar furniture(for want of a better word) loose enough to move if you throw the bike down.
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