It only moves millimetres at a time at a given time.
There isn't a user defined setting that can be turned On or Off to affect this @Darren777
At first I thought mine wasn't moving until I placed a piece of paper directly underneath it and then could see it had moved.
If you still feel it's not moving then my advise would be to turn AOD Off then reboot the phone by turning it Off and On and then turn AOD back On.
If no resolution then turn AOD Off in the interim and then seek out m a Samsung Experience Store or Samsung Service Centre can take a look.
Current Phone ~
Samsung Note 20 Ultra 5G SM-9820 _256Gb SnapDragon 865+
Samsung One Ui 2.5/ Android 10.