Export Image - Wrong aspect ratio

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I woudl like to export some Advanced charts for my master thesis.
Sadly the aspect ratio seem to become wrong when you reszise the window before export. You can see the problem if you take a look at the font. Is there any other way to export or a workaround?
I could simply take a screenshot as the view in RapidMiner is correct! But maybe someone knows a nicer solution.

 

a quick example. the font looks quite ugly because it becomes compressed.