Hello @Clare13,
If you're finding that dates months in the future are unblocked when you don't want them to be you could try changing your "booking window"
This setting can be seen by
goining to your calendar
clicking on "Availability settings" in the balck bar at the top
selecting "reservation settings"
If you set the booking window to, say, 3 months then all dates 3 months from the current date will be blocked.
Remember though that the blocking will move. So if today all dates from the 8th of Feb are blocked, tomorrow the 8th of Feb will be free and dates from the 9th blocked.
If you want dates closer than 3 months to be blocked you can block the desired range of dates manually by selecting the first date and dragging the little 3 vertical bar button to include the last date and then selecting "Blocked"