How to group or un-group icons on Windows 10 Start ?

This is a short post to discuss how to group or un-group programs in Windows Start screen. But before we get there, if you have a new Windows 10 computer, then you might have observed that there are lots of stock programs preinstalled and occupying space on the Windows 10 Start screen. Let's first see how to remove some of those program icons and keep only what we need. And then, we shall see how to group icons and un-group icons.