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Gimbals drift because their accelerometer and gyro (called an "IMU") have a margin of error. When a gimbal starts to drift, the IMU has incorrectly determined the gimbal is moving. So the gimbal is panning to compensate for phantom movements.
The Pan Drift Compensation feature can be used as a last resort in difficult situations to lessen the drift, and hopefully help hold a lock off.
However, we strongly recommend seeking other solutions first. Since the error is generated inconsistently, the solution of using gimbal drift will also be inconsistent.
Also, even something as simple as panning a couple of degrees can reverse the polarity of the gimbal's IMU error. If you had drift compensation turned on in the opposite direction before, your drift compensation may now stack with the IMU error and exacerbate the drifting even more. It can quickly become an issue you are chasing all day.
We encourage users to properly use the gimbal's heading assist features and reading the gimbal's manual to understand best practices around drift. Rebooting, rebalancing, retuning, even pointing the camera straight down can all help calibrate the IMU.