By default, ShipStation prints Packing Slips inline when generating label batches, so each packing slip is matched up with its appropriate label. If you wish to not print packing slips inline with your labels, do the following:
Head to your Account Settings (the gear icon in the upper right).
Next, select Printing and then Printing Setup from the sidebar on the left.
The Document Format column displays your selected format, and will show if packing slips are set to print with the labels. In this example, the Packing Slip option shows it's included in the label format. Click Document Options to change this setting.
Here, you'll see the different formats for printing. Select the format appropriate for your printer and preferences, and does not include the packing slips.
Save your changes.
Now you can set up your Packing Slip preferences by clicking the Document Options link for Packing Slips.
In the Packing Slip options window, choose the format you'd like your packing slips to print to:
Now your packing slips and labels will print separately!
Please keep in mind that this configuration will require two print actions. ShipStation does not currently send label and packing slip print jobs simultaneously if your document options are not set to print packing slips inline with your labels.