Canon EOS 77D Instruction Manual page 250

Shooting Function Settings
In Creative Zone modes, you can set the ISO speed by pressing the

<g> button.
When you set w (Partial metering) or r (Spot metering), a metering

circle will be displayed at the center of the screen.
250
Exit the setting.
3
Press <0> or the <Q> button to

finalize the setting and return to Live
View shooting.
You can also select [2] to return to

Live View shooting.