Normally, a Graph Chart is designed to the required size and formatting on a Form/Report. The design stays with its dimension for ever, unless the developer has second thoughts and modifies it.  But, there is a way to resize the Chart Object automatically when the user resizes the Chart Form Window.

This is true when the Microsoft Access Application window is maximized; the chart object dimension and font size changes according to the window size and screen resolution.

Click here to learn more about this method and to get the VBA Code.