Hi Hao,
Greetings from Syncfusion.
We suggest you to set the width property in border as 0 of
the chartArea to achieve your requirement. Please find the below stackblitz
link for your sample reference.
Sample link: https://stackblitz.com/edit/react-ugp6st?file=index.js
Code Snippet:
|
<ChartComponent chartArea={{ border: { width: 0 } }}></ChartComponent>
|
Screenshot:

If the reported scenario still persist, please modify the
above sample to replicate the reported scenario. It will be helpful for us to
analyze further and assist you better.
Regards,
Swetha