https://www.techradar.com/news/windows-10s-start-menu-could-have-a-nifty-change-in-the-pipeline

Microsoft has apparently sneaked in a change to the Start menu for Windows 10 ‘skip ahead’ testers – who are now working with the next big update due to land in the first half of 2019 – and it seems the plan is to change the menu in a simple but interesting way.

The change is that when you hover the mouse pointer over an icon in the left-hand pane of the Start menu, the menu in question is displayed after a slight delay of a split second – as opposed to just a tooltip telling you what the icon is, which is what pops up currently.