Do you mean the "show only this section" box? And the box which then says "show all sections"? That has gone, because there is an option in the course settings to show one section at a time -see Course layout 1.7 here Course settings
Courses and course formats
Topics on Course page
Αυτή η συζήτηση κλειδώθηκε κι έτσι δεν μπορείτε να απαντήσετε σε αυτή.