Employee Holiday Tracker

Hi Guys

How are you All?
I am having some problem, regarding this tool,
On the sheet i can only show the days up to 21st for every month.....How can i extend this from up to 31 for all the months
Please click on OPen form on sheet . on the days available section there are only 21 days, i need this section to show same dates are in calendar..
Could you please hel me,

Thanks for your kind help