How to enlarge chart size for viewing?

[GOH]

I have some charts that I created on a sheet itself. However, the chart did
not occupy the whole sheet instead only a small portion in the centre which
is abit too small to view. How can I resize it?

 

[David Biddulph]

If you move the cursor over one of the square black blocks on a side, or in
a corner, of the chart, the cursor will turn to a resizing arrow.