若要防止在弹出窗口外部单击时关闭弹出窗口，可以使用FullCalendar中的交互对象。具体来说，可以将弹出框类型的enabled属性设置为false。这样，当在弹出窗口外部单击时，弹出窗口不会关闭。
示例如下：

import { Calendar } from '@fullcalendar/react';
import interactionPlugin from '@fullcalendar/interaction';

const MyCalendarComponent = () => {
  const handleEventClick = (info) => {
    // Your event click logic here
  };

  return (
    <Calendar
      plugins={[interactionPlugin]}
      events={[
        // your event data here
      ]}
      eventClick={handleEventClick}
      eventPopover={{
        enabled: true,
        // By default, clicking outside of the popover will close it.
        // To prevent this, set the interaction.enabled property to false.
        interaction: {
          enabled: false,
        },
      }}
    />
  );
};

export default MyCalendarComponent;

您也可以参考this