Start Up Menu

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When Clicking on "Start" and the menu appeares and I scroll up to "Documents"
,all of my recently accessed documents are shown on the side bar. How do I
elimenate these recently accessed documents from being shown? I kwow that I'm
able to clear up this menu (Temporarly) by cliclking on the Properties of the
Taskbar & Start Up and clicking on Clear, but I must be able not to have them
shown at any time.
Thank you for your time and your post.
.