Moodle quiz question type forms can get quite lengthy. It would help to hide fields that aren't essential. There is often only one format option available in question type html editor fields. So the select field is irrelevant. Use a hidden input field instead,

This is a core change which will affect all html editor instances. This issue also occurs in course activity edit forms with the introduction field. Space will be saved there too.

This option is common in in the description field of the course activity settings forms and in quiz question types such as Drag and drop and matching.

OU bug #947