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carrotmuseum said:

Thanks Edwin. No one tells you this stuff, and certainly not M/s.

That's one of the reasons for reading forums such as this one, lots can be learned. Same thing for books, the Books for Dummies are quite useful [probably wouldn't have been a catchy title if they called it Books for the Uninformed].

There is a very simple way. Because I live in Singapore, Cortana is turned off by default because English(Singapore) is not a supported language. Simply change your device language to something other than the one listed like English(Singapore), and press the default language button. ta da Cortana gone and magnifying glass back.
Unless this isn't the one you are asking for.