No, you can't :-). Well, you can under settings/apps/manage - but that is not where the magic happens.

It simply changes the behaviour of the field “Required to solve a ticket”. You can’t see any changes in the interface - only in the behaviour.

Go to settings/manage/ticket fields and find the field you want to be filled out.

When you check the box “Required to solve a ticket” the ticket field must be filled out before you can update the ticket. Ie tap “Open”, “Pending”, “On hold”, “Solved”.

Please have everyone using the app to refresh their browser after you have updated fields in settings.