How can I reduce the size of the diagram borders after switching off the legend?

The size of the border is auto-adjusted only if some text or graphics reaches out of the view. Therefore, if you would like to make your borders smaller, you have to do this manually. Click on the frame of the graph to select it and then drag the borders to the desired positions through one of the four selection handles or double-click the graph (not the curve) to open its property sheet. Then open the Size tab and set the margins to the desired values.

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