My OPPO A5 (2020) uses a large amount of mobile data

Slide two fingers downwards starting from the top of the screen.

Press the settings icon.

Press Wi-Fi.

Press the indicator next to 'Wi-Fi' to turn on the function.

Press Wi-Fi Assistant.

Press the indicator next to 'Intelligently Select the Best Wi-Fi'.

Press the indicator next to 'Auto-switch to Mobile Network' to turn the function on or off.

Press the Home key to return to the home screen.

Slide two fingers downwards starting from the top of the screen.

Press the settings icon.

Press Notification & Status Bar.

Press Manage Notifications.

Press the required app.

Press the indicator next to 'Allow Notifications' to turn the function on or off.

Press the Home key to return to the home screen.

Slide your finger upwards on the screen.

Press Play Store.

Slide your finger right starting from the left side of the screen.

Press Settings.

Press Auto-update apps.

To turn on automatic update of apps using mobile network, press Over any network.

If you turn on automatic update of apps via mobile network, your apps are automatically updated via the mobile network when no WiFi networks are within range.

To turn on automatic update of apps using WiFi, press Over Wi-Fi only.

To turn off automatic update of apps, press Don't auto-update apps.

Press DONE.

Press the Home key to return to the home screen.