Okay, I figured this out on my own... in POS, went into security mode, selected Recall, selected Void an Invoice, then on the date selection window I hit Control S, clicked on the OKAY button and set the security levels to disable from level 6 on down. Control S again, got out of security mode. OKAY button now greyed out to anyone level 6 or below. Then checked cashier security levels for all users to adjust so unauthorized cashiers can't perform voids.
