OnePlus devices are missing a fundamental Android 10+ feature: the dark mode.
Get a quick settings tile and enable a few automatic tricks to get the best from the Dark Theme.
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Go to the system settings, open the device info screen (where there is the Android version), then tap 7 times on Build Number.
Open the Developer Options setting and enable USB Debugging.
Connect your phone to the computer via USB cable. If a popup is displayed on your device, click Allow.
Download ADB (Android Drive Bridge) from here and install it on your computer.
Open a terminal and move to the folder where you have installed the ADB.
Then run the follow command:
./adb shell pm grant com.tommasoberlose.darkmode android.permission.WRITE_SECURE_SETTINGS
Based on your OS you'll need to execute the command ./adb [...] or .\adb [...].
If everything worked you can restart the app and start using the Dark Mode on your device.
Copyright (C) 2017-2020 Tommaso Berlose (http://tommasoberlose.com)
Another Widget binaries and source code can be used according to the MIT Licence.