Looks like you submitted a duplicate thread at How to decrease the size of System Settings and remove the Time Zones from the Calendar, which I have already answered.
Please don’t do that. Duplicate threads fork the discussion and confuse everyone.
I will migrate my answer from there:
At the moment, neither is possible. System Settings has a minimum size that is rather too large ( see 395476 – The minimum window size of System Settings is too big for a 1366x768 screen) and time zones always appear in the Calendar popup when you’ve configured them.