PCs come in all shapes and sizes which means that the Start menu, which takes up roughly the same amount of screen real-estate regardless of size, can definitely come in handy.
On a smaller display, however – such as that of a compact tablet – this can get annoying. Luckily, resizing the menu is simple: move the mouse to any corner and drag it whichever way you want. Once it’s the right size for your screen, let go of the corner and it’ll stay that big. If you want to adjust it further or move it back, just repeat the process until you’re happy.