If you need to turn them off, here is the solution
1. On the desktop, right click on a empty area on the Taskbar, then click on "Properties"
2. In the newly popped up windows "Taskbar and Navigation properties", Uncheck "Store and display recently opned items in Jump Lists" or you can change "Number of recent items to display in Jump Lists:" from default "10" to "0". Then, click "OK" to finish and close.
3. Now, check again, your jump list will be disappeared. Hopefully, this will help.