In the mobile workflow editor, navigate through to the On Site tabs list page.
click on the Finish Time tab.
tick the Finish Date/Time question
click Select an Action dropdown and choose copy to another tab
click the same job type, then 'on site' then 'Time Review' tab.
Back on the On Site tab list page, make sure the Finish Time tab 'visible' option is unticked ......oh and the Time Review is ticked visible :)