How to apply canon 6 1 point focusing?

I use 5D3 myself, and there are about three scenes that will switch the focus mode of the focus position and focus range.

First, the most commonly used center point+single focus, generally dealing with still life portraits. You can also set the focus position in advance.

2. 6 1:00 all on+ automatic focus switching+continuous tracking and focusing+high-speed continuous shooting, which is mainly used for shooting fast-moving objects, such as motion and follow-up. [Set the custom key+preview of depth of field to switch instantly, without mode dial and shoulder screen, and the continuous shooting needs to be turned on in advance].

Third, preset focus position+continuous focus+high-speed continuous shooting. Suitable for shooting close-ups of sports themes. You can make a bust if the lens is long. This is better, because you are sure of the composition.