Hello Hank, and welcome to Seven Forums.
This would be your "Recent" items from the "jump list
" of your pinned "Windows Explorer" on the taskbar.
Double check using the tutorial below to make sure that you have recent items turned on. If you do, then you may have cleared them by mistake, and it may take a day to repopulate the jump list as you use the pinned Windows Explorer. Recent Items - Turn On or Off
Hope this helps for now,