There were different sectors. The US had essentially the South. There were also the British sector and French. The Soviets were the fourth sector but we all know how that one was quite different from the other three.
While the French and British have mostly left, the US stayed. Though to be fair even the British still do have some bases it seems as NATO troups. But no more large garrison in many larger cities.
The US on the other hand is still there with much larger force. Like think back to "Air Force One" (the movie with Harrison Ford) which used Ramstein Airbase in the movie (though they didn't actually film there) and that airbase has come up in the Iran conflict as a conflict of its own. Meaning Germany didn't want the US to use it as a hub for US operations (supply logistics) for the Iran war.