re:
Like thus?
That is the new normal if you want Cortana on your Win 10 box. You can still search in the box... Like this:
As you can see, it searches locally on your machine or on the web.
If you are expressing another issue we need more details.
If you just want to disable Cortana you may do so, but I see huge advantages in having her active on my computer.
Open Cortana by clicking on the search bar > select notebook (the icon to the left that I highlighted) > choose "settings" > after settings opens you may toggle Cortana to off...
If there is something else going on you will have to let us know. Welcome to Windows Central.