Windows 10 shows shortcuts of recent files that you accessed on your computer as Quick Access items in File Explorer. Though it is a handy feature for many, some may consider it as privacy issue and may not want to display the files especially when a same PC and login is shared between multiple people.
But no worries, the list can be cleared easily and you can set it up to no longer collect the history of accessed files. In File Explorer click on View tab and then click Options.
In the Folder Options dialog box, click on Clear button to delete already existing list and then uncheck the boxes Show recently used files in Quick access. If you don’t want to show Folders as well, then you may want to uncheck Show frequently used folders in Quick access. Click OK.
All remembered items should be gone along with the Folders too. You will only see system folders : Desktop, Documents, Downloads, and Pictures. Any folders which you have created and accessed will not be shown.