Windows: If your Start menu isn’t quite big enough for all your tiles you can quickly make it bigger by pressing Control+Up.
Try it out now: just open the start menu, then use the keyboard shortcut. You can also use Control+Down to make it smaller, if you overdue things (we did). Failing that, you can also manually re-size the start menu like you can any other window. Thanks to the incomparable @SwiftOnSecurity for the tip.