<!-- Add a `defaultValue` prop: string for single, array for multiple --> <Accordion type="single" defaultValue="item-1"}> <AccordionItem value="item-1">...</AccordionItem> <AccordionItem value="item-2">...</AccordionItem> <Accordion type="multiple" defaultValue={["item-1"]}> <AccordionItem value="item-1">...</AccordionItem> <AccordionItem value="item-2">...</AccordionItem>