<DateCalendar
  defaultValue={dayjs('2022-04-17')}
  slotProps={{ calendarHeader: { format: 'MM/YYYY' } }}
/>
<DateRangeCalendar
  defaultValue={[dayjs('2022-04-17'), dayjs('2022-04-21')]}
  calendars={2}
  slotProps={{ calendarHeader: { format: 'MM/YYYY' } }}
/>