The Display to Candidate check box can be found on the Assignment under the Main Details tab.
Selecting this option will allow the candidates to view a gross pay calculation in their candidate portal for all of their submitted timesheets. This option can therefore be selected if you wish for your candidates to be able to view this information. This information is not visible on the timesheet image and will not be visible to the authoriser.
This option is not related to allowing your candidates to view their payslips through their portals. For information on this please take a look at the following article: