Resizing a chart is a common use case. If you just use native tools of Sketch/Figma/Adobe, you will see that the result is not good. To keep the high-quality results you need to apply Update option once you've resized your chart manually: resize chart as you want, then select it and go to
Plugins → Chart → Update chart and wait for ✨ the magic.
Check this short video to see how it could be done: