Displaying The Chart In A Full View ?

Hello,

Using Excel 2007

Have created a chart, and it looks just fine.

But, in the chart view sometimes it seems to open up,
centered, but only using perhaps half of the available screen area.
Big, blue, non-chart area on each side.

Other times it fills the whole screen.

Both cases, it displays everything, just shrunk in the one view.

Is there some way to simply click on something to switch from
one "view" to the other ?

Thanks,
Bob