What's the function of this turntable on the digital camera?

There is a speed control button dial on the back of the digital camera, which makes the operation in photography convenient and quick, such as adjusting the flash state, taking selfies, macro and deleting. More professional cameras also have a turntable with driving mode on the top of the camera, which is used for positioning before shooting. For professional mode or simple mode, such as shooting sports games, just switch to sports mode, and other data selection and formulation are not necessary.