It is in the config files but you can also do it from within the game.
Once you have the window in place you can move and resize it, but in order to move it you need to drag it by the title bar and in order to resize it you need to drag it by the borders.
This means you have to edit the title bar and borders and make them visible first if they are not already, move/resize and then hide them again: highlight the "window" item in the middle column of the right-click-->customize menu and you'll see the relevant options appear in the column on the left.
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