Canon EOS RP Instruction Manual page 740

Custom Function Settings
C.Fn II-3: AF point auto switching
This sets the switching sensitivity of the AF points as they track the subject
moving dramatically up, down, left, or right.
Takes effect when [ z : AF method] is set to [ u +Tracking], [Expand AF
area: Z ], [Expand AF area: Around], or [Zone AF].
0
z
Standard setting for gradual AF point switching.
+2 / +1
z
Even if the target subject moves dramatically up, down, left, or right
and moves away from the AF point, the camera switches its focus to
neighboring AF points to continue focusing on the subject. The camera
switches to the AF point deemed most likely to focus on the subject
based on the subject's continual movement, contrast, etc. Setting +2
makes the camera more prone to switch the AF point than with +1.
However, with a wide-angle lens having a wide depth of field or if
the subject is too small in the frame, the camera may focus with an
unintended AF point.
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