To leave a quota of a student of the school to zero we must accede to Planning → Courses → Courses/Schools.



Once we have entered, we will click on the icon  in the school where we want to leave the account of a student to zero:



Now we will access the section Payments Control and we will see the list of payments of the school:



To leave a quota of a student of the school to zero we will click the icon  and the quota will disappear from the listing.