Thank you. I tried all of these and none of them worked. I contacted Dell support and I learned that your computer collects all files you have opened and if you type, for example, a file extension like jpg the computer shows all the files you have opened. This means you have no privacy. Anyone who has access to your computer can view every file you have looked at or worked on. The tech support at Dell said this can not be deleted or turned off.
I consider this extremely serious and I think every user of windows 10 should be advised of this.