It’s possible after upgrading to the 1709 build you can’t find the option to enable the Files on Demand option for OneDrive, this is caused by not having the latest & greatest version of the OneDrive client.
To get the option in your settings tab, you can wait for the update to be rolled out or manually install this one https://go.microsoft.com/fwlink/?linkid=851311 (version 17.3.7073)
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