You can specify default "Print to" printing methods per document, per user on your account, and per browser.
When you are ready to print from ShipStation, the first time you print a certain document you will be prompted with printing options. These are user specific and saved in your browser, so each of your users and each of your workstations can have different printing defaults.
Check the box to “Remember my selection and always do this for this type of document” before selecting your printing option.
You can change this at any time.
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.
Click the link from under the Print To header.
Here, you can change how the labels print by default for each document.