You block the feature at your WiFi router by naming it with the suffix _optout. It doesn't look you can disable it at W10 you can just keep W10 from sharing your wifi info with everyone in your contacts list.
Quote from the link:
In an attempt to address the security hole it has created, Microsoft offers a kludge of a workaround: you must add _optout to the SSID (the name of your network) to prevent it from working with Wi-Fi Sense.
(So if you want to opt out of Google Maps and Wi-Fi Sense at the same time, you must change your SSID of, say, myhouse to myhouse_optout_nomap. Technology is great.)
David Ingram
F18 USA 242
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