P129 I get horizontal label instead of vertical label

You can setup printer to rotate it for you automatically.
For Mac：

Open a desired file and printing -> click "Show Details"-> select printing direction in "Orientation"

For Win：

Go to "Control panel" -> "Devices and Printers"
(Right click on "This PC", choose "Properties", then click on "Control panel"-> "Devices and Printers")

-> Right click on "Label Printer" -> choose "Printer Preferences"

-> Go to "Page Setup" -> Select printing direction under "Orientation"

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