You can turn off and modify passcodes with ColorOS versions. Check your ColorOS version in [Settings] > [About phone].
Turn off or change your passcode
For ColorOS 5.2 On the phone with a passcode. Go to [Settings] > [Fingerprint , Face & Passcode]. After you have set a passcode, you'll find two options:
[Turn off Passcode]: To turn off passcode click on “Turn off Passcode” then enter or draw passcode or pattern to turn off your passcode.
[Modify Passcode]: To modify the passcode enter or draw the old passcode or pattern, then enter or draw a new one, or click on [Other Encryptions] to switch the other passcode categories.
* Pictures, settings and paths might differ from those of your phone, but that do not affect the description in this article.