The missing "free option" in "Tap mode" (the option wich allows to keep direction while changing yaw) could have a meaning, since back and side sensors are missing, in Mavic Pro, but then... why course mode keeps direction, while allows yaw?
You tap the display screen and the UAV goes in that direction at a choosen speed.
If you tap along the virtual horizon line, the altitude is kept.
If you tap over that line, the UAV ascend, the opposite when tapping above.
In other UAV than Mavic Pro, DJ4 GO allows to chose if the original direction is kept in any case (you can yaw and film or shot in another direction) or is modified by yaw.
With Mavic Pro, changing the yaw, changes the direction.
A quick way (handy) to send the UAV toward a point.