The milestone events are displayed in diamond shape by default while we need to showcase the gantt chart with different shapes for different milestone events, I have attached the sample of the requirement. Is there any configuration to set this?
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Please use the above basic CSS rule to style. Basics of CSS: https://developer.mozilla.org/en-US/docs/Web/CSS
You can achieve circle / square shapes with basic CSS too. https://css-tricks.com/the-shapes-of-css/
Or use an icon library: https://fontawesome.com/