The Chart title will adjust automatically to the size of the text.
If you want more control over the width or height, you can delete the
title, and use a text box instead.
To create a text box, select the chart, and type the text.
As you type, you'll see the text in the formula bar
Press the Enter key, and the text box will appear in the centre of the chart
Drag it to the top (or any other location), then format it, using the
buttons on the formatting toolbar.
