Within Shipstation, there is a limitation of only selecting 500 orders at a time, which is why the print option greys out. They provide the option to select more than 500 orders to possibly bulk update those orders. We really need to be able to select the all orders selection and print a pick list when our order que is over 500 orders. Right now the print option greys out, so we have to print multiple reports for our production team which isn't efficient for them to get totals of what needs to be manufactured. Please add this availability soon.