Enabling the option for developers in the OnePlus 6 is not so difficult and today you'll learn how. Please follow the following instructions.
Step 1: Turn on your OnePlus 6 and open your menu settings.
Step 2: Go to the bottom of the screen and click "About phone".
Step 3: When you get to the new screen, scroll down again until "Build number".
Step 4: Click on the build number 5 times and you should see a message notifying you that you are now a developer.
Returning to the configuration, you will have to find a new option called "developers". You can do lots of things with it, including damage your device, so be careful when playing around with it.