Canon EOS R50 Mirrorless Camera (White) - Manual (Page 420)

2.
Focus and shoot/record.
A tracking frame is displayed (in green for One-Shot AF or blue for
Servo AF) when you press the shutter button halfway, and the camera
beeps (only for One-Shot AF).
An orange tracking frame indicates that the camera could not focus on
subjects.
Note
Selecting a subject by touch with [ : AF area ] set to [ Whole area AF ] changes
the tracking frame to [ ] and locks on to that subject for tracking across the entire
screen.
To release locked tracking, tap [
].
Pressing the shutter button halfway when the AF point does not overlap the
tracking frame [
] will focus using the active, white AF frame.
For human subjects, the active [ ] may cover only a part of the face, not the whole
face.
The size of tracking frames varies depending on the subject.
420