Windows 10 - Cortana disabled.....

Cortana is a very inquisitive resource-intensive feature described as being something none of us knew we needed. Some of us still don't, and if you're one, then yes, you can disable it. Your Search will then look like this....

If you open Cortana, and then along the left edge, click on the Settings icon, you will find a couple of buttons you can turn off. Turning them both off disables the beast without burning any bridges you might want to rebuild later. Meanwhile, Peace returns to the valley. Your Processor won't be nearly as active while doing your usual thing. And that's good, especially if you're running an older machine with limited capabilities.