You can scale your chart to size with the square handlers in the corners. The same goes for the circle handlers on the top, bottom, left or right.
Please note that text appearing within inserted charts can only be modified within the chart settings.
The shift key can be used to resize your chart proportionally (in ratio), or you can change the length, width, and height. You can do this with the charts similar to any other graphic element on your canvas. Click through to learn how to resize.