To make Start full screen and see everything in one view, select the Start button, then select Settings > Personalization > Start , and then turn on Use Start full screen.
The next time you open Start, the Start screen will fill the entire desktop. Select All apps for a full-screen view of all your apps and programs, or stick with Pinned tiles for a more dynamic view.
Menu (expands to show names for all menu items)
If you just want resize the Start menu a bit to make it taller or wider, select the top or side border and drag it.