In Month or Multi-week view, you can switch between a flexible grid and a static grid. To switch between them, use the arrow in the top left, above the week number.
Flexible grid: If you have more events than are visible in the standard size of the day boxes, the row will expand to make all events visible. Some weeks may be out of view with the expanded rows. Use your mouse wheel or the scrollbar on the right to view the weeks not visible on the screen.
Static grid: Rows will not expand, even if some events will be hidden. There are individual scroll bars for each row. Use your mouse wheel or the scroll bar to view the hidden events.