Canon EOS R50 Mirrorless Camera (White) - Manual (Page 412)

: Expand AF area:
Focuses using one AF point [ ] and the AF area 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 Flexible 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 the surrounding AF area outlined here in blue, which
makes it easier to focus on moving subjects than with Expand AF area: .
When Servo AF is used, first you will focus using an AF point [ ].
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