Turnoff OF2 calendar subscription as "busy"?

I have subscribed to OF2 due items on my Google Calendar for quite some time. now i have a scheduling app that “looks” at my Google calendar to see if i am busy to show my availability.

i tried asking BusyCal and they said that it’s as OF2 internal subscription settting. by default OF2 due items are set as “busy” in the calendars. just because something is set as due at 4pm (OF2 forces a time) doesn’t mean i want that time blocked on my calendar availability.

other calendars that i create can be set as either “Busy” or not. this is wreaking havoc on my scheduling.

how can i turn this off, please?