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 & U 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 > Settings > Calling Accounts > 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.