It is quicker and easier to end a call by using your device's power button than the on-screen buttons.
Method 1:
realme UI 1.0 & above versions: Settings > Search "Press Power Button to End Call" > Enable Press Power Button to End Call.
realme UI R & S Edition: Settings > Accessibility > Enable Press Power Button to End Call.
realme UI T & Go Edition: Settings > Accessibility > System controls > Power button ends call.
Method 2:
To enable the option please follow the below step
Open the Phone app > Tap More options > Setting > Calling Account > Turn” Use the Power button to end calls when the screen is on” on or off
Note: Use the power button to end the call when the screen is on.
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