Filidecht has the answer
For the target window, within the first Page tag, you will find
DynamicDataFilter="0001"
Change that to
DynamicDataFilter="0000"
To make it so it won't close.
Unfortunately, it also doesn't open automatically when you target something. You will need to use the following command (CASE SENSITIVE) to make the window appear each time you log in (and possibly zone?):
Code:
/show_window MainHUD.Target
On a side note, you can add the following to any window just below the first Page tag to make it stay open when you hit the Escape key. (But it won't, for instance, stop the target window from closing when the target dies or gets out of range.)
Code:
<Button IsCancelButton="true" Name="EscapeKeyBlocker"/>
(You may need to search for any other instances of IsCancelButton="true" and remove them.)