I've started playing ESO in 2014, on the EU megaserver. Then I left fro more than a year. When I came back, I relocated on the NA megaserver and here are all my friends and main characters. Yesterday I installed PTS for the first time and (not knowing better) I chose my own EU country in the country selection window and when I logged in, there were all the EU characters. I tried switching to NA megaserver to no avail. Switching the megaserver only works for the main game, not the PTS apparently.
My question: Is there a way I can switch the megaserver (from EU to NA) on PTS?
(I intend on exploring the new dungeons first hand with my friends from NA megaserver.)