Not sure why the helper window lands in the middle like that. It can happen if you load a preset layout that has a horizontal dimension larger than the width of your display. It should be in the same place regardless of which character you're running.
Krisla is correct about using the F10 toggle to help see where the window is.
Once you have the layout the way you want it for one character, don't forget that your other characters can load those settings to get the identical layout at minimum effort.
-= Therendil =-
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