Selected Date fontsize

[Imran-Munawar-synavos]

How to change the Selected Date fontsize for ExpandableCalendar??

          <CalendarProvider
            date={moment(selectedMonth).format('YYYY-MM-DD')}
            showTodayButton={false}>
            <ExpandableCalendar
              animateScroll
              ref={calendarRef}
              initialPosition={Positions.OPEN}
              markingType="multi-dot"
              onCalendarToggled={onCalendarToggled}
              renderHeader={renderHeader}
              markedDates={markedDates}
              firstDay={1}
              onMonthChange={month => {
                setSelectedMonth(month.dateString);
              }}
              theme={{
                // days
                dayTextColor: Colors.black,
                textDayFontFamily: Fonts.getFontFamily('Medium'),
                textDayFontSize: Fonts.normalize(16),
                textDayFontWeight: '500',
                // day header
                textDayHeaderFontFamily: Fonts.getFontFamily('Medium'),
                textDayHeaderFontSize: Fonts.normalize(14),
                textSectionTitleColor: Colors.gray_858585,
                textDayHeaderFontWeight: '500',
                //selected day
                selectedDayBackgroundColor: 'transparent',
                selectedDayTextColor: Colors.primary,

                todayTextColor: Colors.primary,
                arrowColor: Colors.primary,
                textDisabledColor: Colors.gray_858585,
              }}
            />
            <AgendaList
              sections={agendaSections}
              renderItem={renderItem}
              sectionStyle={styles.section}
            />
          </CalendarProvider>

I have select the 2nd july now want to the fontsize as well how i can do that??