Take a look at the SciChartSurface.Padding property. This can be set to zero in Xaml to reduce the size of padding all around.
I advice you to also take a look at Snoop for WPF, which is a very powerful (and free) visual debugger. Using Snoop you can inspect the chart and all of the items in the visual tree, see property values (such as margin, padding) and change them dynamically to see the effect. If you’ve ever done web-development this is like Firebug but for WPF.
Hope that helps!
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