Oppo Find X - Replace terrible ColourOS Launcher

[Android Central Question]

Hey Guys!!

I might be being a bit stupid but, I cannot find a way to change the default Launcher.

If I look at settings-> Default App Management there is no option for Launcher.

If I open Nova Launcher, click settings, it tells me it is not Default and I tap to set. I then "Home Screen Launcher" it only lists ColourOS.

Any ideas?