Metadata list on the Create Question / Modify Question page can be sorted according to if it is mandatory and also in the alphabetical order according to the metadata name.
This can be done by selecting the check box next to Show Required Metadata First on the Project tab of the Configuration page of a project regardless of the mandatory status of the metadata.
When this check box is not selected, the metadata is listed in alphabetical order by its category name on the Create Question / Modify Question page.
When the check box is selected, the mandatory metadata (with the red asterisk *) are listed first and the non-mandatory metadata afterwards, on the Create Question / Modify Question page. The group of mandatory metadata and non-mandatory metadata are each listed alphabetically.