I Googled this for you Nfk
"It is actually pretty straightforward to disable Cortana, in fact, there are two ways to do this task. The first option is by launching Cortana from the search bar on the taskbar. Then, from the left pane click the settings button, and under "Cortana" (the first option) and slide the pill switch to the Off position.
The second option is by launching the Settings app and on Privacy, go to Speech, inking, & typing, and click Stop getting to know me"
Ironically while googling an ad from Admiral popped up saying I had an AdBlocker installed and could I please turn it off!