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I take it your question is referring to the B738 in X-Plane. I’m not a real life 738 pilot, but I believe In real operations, the pilot actually uses the Autopilot Disengage button located on the left handle of the yoke to disengage the A/P. This button is not simulated in the LR default B738, but is modeled in the Zibo version of the aircraft.
As for Auto Throttle, it is a separate system from the Autopilot. So you would need to separately disengage that if you want to “take over” prior to touchdown. That function too, has a disengage button located on the throttle lever(s).
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