label printers are a bit strange. the normal landscape portrait dont work the same way as on a regular printer.
you would usually have to go into the device settings
devices and printers / right click on the printer / select PRINTER PROPERTIES
and that will say what direction the labels will print and the size of the labels and the size you want printed on them etc.
What might be easier is if it worked recently you can try doing a system restore to when it was working and that might put it back the way it was.
System restore instructions - windows 7 8 10
hold the windows logo key and hit R
in the box that appears type
select restore to an earlier date.
Under the "suggested restore" which is usually not old enough to help is a link for "OTHER RESTORE POINTS"
click that if the suggested ones are not BEFORE THE PROBLEM STARTED
choose a date from the calendar that is BEFORE you experienced the problem
hit ok / restore
the computer will start to shut down
a restoring settings box will appear with a status bar
when it finishes your computer will restart with the same settings it had on the date you restored to. your data will not be affected.
It is not perfect. But it fixes a lot of things.