Hi Ton,
Greetings from Syncfusion support.
We have validated your shared sample and suggest you disable
the accordion animation
like the below code to resolve the reported issue.
const animation = { expand: { effect:'', duration:0, easing:'' }, collapse: { effect:'', duration:0, easing:'' } };
<AccordionComponent
dataSource={dataSource}
headerTemplate={headerTemplate}
itemTemplate={itemTemplate}
expanding={expanding}
animation={animation}
/>
Sample: https://stackblitz.com/edit/react-zpehrd-7sz2pt?file=index.js
Kindly try the above sample and let us know if this meets
your requirement.
Regards,
Ruksar Moosa Sait
If this post is helpful, kindly consider
accepting it as the solution so that other members can locate it more quickly.