The scale of the viewing tile can be adjusted.
This can be done in one of 2 ways:
If you click a viewing tile, you can control its size with the buttons on the top panel:
You can also use the mouse to scale the viewing tile. If the viewing tile is maximized to fill the entire screen, a double left-click of your mouse within the tile area will minimize the tile. Otherwise a double left-click will maximize the viewing tile to fill the entire screen.