For individual items that display in the start menu that you do not wish to show, right-click then click "remove from list." It should not display again.
If you do not want fresh installs to show up in the menu (have not used them yet):
- On the Start button, bottom-left, right-click and select properties, click on the Start menu tab -> click on "Customize Start Menu."
- Uncheck "highlight newly installed programs" (between Games and Music) then click "OK" then "Apply" then "OK."
For recently used items/ programs that do not show (they can show from other sessions even if not used in this one):
- Click on the Start button -> right-click -> select "Properties."
- Click on the Start menu tab -> in Privacy, uncheck the items you do not wish to have shown.