Hello M. R.,
RadChart is rendered in html as an image so there are two ways to resize it. You can set its size (width and height) in the server-side code or you can resize the image within the browser as shown in this code library
The line -- you can take advantage of the Marked Zones feature
(example is available here
). Providing equal values for one of the pairs [ValueStartX, ValueEndX] or [ValueStartY, ValueEndY] would lead to displaying only the border, here is an example:
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