As mentioned in post #1 at the download box of Junction View file D4385000A.JCV, it is the portrait version, not the landscape version.
Further, the specs of the zumo 660 show that Junction View is displayed with Lane Assist. This suggests portrait mode (see images below).
For information, please also note the difference between Lane Assist (lane indications in the top left corner of the screen) and Junction View:
Lane Assist:
Junction View (landscape):
Junction View (portrait):
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