If these subjects are from different classes check this article:
If they are from the same class:
OK, but the software puts Math there instead of Spanish!
If you do not want to have English alone at the end of the day and Spanish alone at the end of some other day, you might use this: see שתי קבוצות הלימוד חייבות לסיים את יום הלימודים באותה השעה
Another option is to join the groups or class, but use this only when the join is always the same: How to specify lessons where students are joined from two classes?
For a very special case you can say that groups have to start at the same time: קבוצות צריכות להתחיל באותו הזמן
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