It seems in the standalone version, the heading hold on the autopilot doesn’t work. I put on the heading hold and it went right through the heading assigned.
King Air Autopilot
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- Official Post
The button does several things, hope I programmed it correctly. First push should put you into heading mode (HDG visible in the flight mode annunciator on the PFD) a second push will put you back into roll hold (ROL) which probably happened to you.