That's a SOE option that I made easily accessable via my targeting window by placing a button on the top left.
ThorUI offers the "old" arrow style targeting AND the "new" wing style.
If the reason you are uninstalling ThorUI is because you want the wings, then re-install ThorUI AU and once in game click the little button in the top left hand corner of the targeting window to toggle the styles.
-or-
Simply press (Allt-O) to access your in game options then select "User Interface" then expand "Name and Chat Bubble" then change the first item between Details (Arrows) and Simple (Frames) aka wings.