Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 290)

: Expand AF area:
Focuses using one AF point [ ] and AF points outlined here in blue. Effective for moving
subjects, which are difficult to track with 1-point AF.
Focusing on your preferred subject is easier than with Zone AF.
When Servo AF is used, first you will focus using an AF point [
].
: Expand AF area: Around
Focuses using one AF point [ ] and surrounding AF points outlined here in blue, which
makes it easier to focus on moving subjects than with Expand AF area: . Servo AF
operation is the same as for Expand AF area: .
290