Staff slip print: Stuck in Landscape, the option to change that is missing

Overview: 

When printing a staff slip, I can only print it in landscape. In the printing options, there is no option to change back to portait.
 

Steps to Reproduce:

In FOLIO Juniper Bug Fest >> Settings >> Circulation >> Staff Slips >> [Any of the four; this bug was tested on] Transit >> Preview >> Print

I confirm this also happens when checking in an item.

I confirm that it's the exact same issue in Edge (for Iris and Juniper) [sorry, don't have other browsers or operatings systems at hand).

Expected Results:

In Iris, the staff slips are by defaut in Portrait - this should remain in Juniper. [StaffSlip_PrintView_IrisWithLayout.PNG]

Actual Results:

The page is in Landscape, and there is no option to change it. [StaffSlip_PrintView_JuniperWithoutLayout.PNG]

Additional Information:

I have this quote from the Vega grooming meeting of 10 Aug which could maybe help: "There's a special tag in CSS to overwrite browser settings."

Interested parties: Cornell // Anyone using Juniper live.