Canon EOS REBEL T8i Advanced User's Manual page 686

C.Fn 7: AF area selection method
0: →AF area selection button
After you press the <
button changes the AF area selection mode. In Live View shooting, pressing the <
button changes the AF method.
1: →Main Dial
After you press the <
selection mode.
Note
When [1: →Main Dial] is set, use the <
horizontally.
C.Fn 8: AF point display during focus
You can set whether to display AF points during AF point selection, before AF begins
(shooting standby), when AF begins, during AF, and when subjects are in focus.
AF point display during focus
0:Selected (constant)
1:All (constant)
2:Selected (pre-AF,focused)
3:Selected AF pt (focused)
4:Disable display
> or < > button in viewfinder shooting, pressing the <
> or < > button, turning the
AF point Before AF
selected (shooting standby)
○
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○
686
dial changes the AF area
> < > keys to move the AF point
○: Displayed, ×: Not displayed
During AF
○ ○
○ ○
○ ×
× ×
× ×
>
>
Focus achieved
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×