Canon EOS 77D, Instruction Manual, Page: 81 / 502

81
If you set this function, <
G
> will appear in the viewfinder when
the camera detects flicker caused by the blinking of the light source. By
default, flicker detection is set to [
Show ].
1
Select [Viewfinder display].

Under the [
5
2 ] tab, select
[ Viewfinder display ], then press
<
0
>.
2
Select [Flicker detection].
3
Select [Show].
3
Displaying the Flicker Detection
N
If you set [
z
5: Anti-flicker shoot. ] to [ Enable ], you can shoot with
reduced unevenness of exposure caused by the flicker (p.185).