Permanently Disable Bitlocker Windows 10

I want to revert to the previous behaviour of switching off Files On-Demand altogether rather than being forced to have it on and then marking everything as 'always keep on device'. Clearly this is possible because that is how my work PC behaves with exactly the same version of OneDrive installed. Does anyone know what registry settings will force OneDrive to revert to the old behaviour of having a slider switch to turn off Files On-Demand? Alternatively, if it is not easily possible to make the slider switch reappear, how do I simply turn off Files On-Demand altogether?