I had to use “top” for it to work for me, but honestly I cannot remember why… so, this is another option if the other does not work. I also size the window slightly bigger than the course itself to accommodate for the browser title bar and border. My actual course size is: 1009 x 662
When you are publishing, make sure the checkbox for “launch course in separate window from the LMS.” is checked. I set up a group at the topmost course level with two actions: 1) The action to resize the window, 2) An action to set a variable that this was done (var_WinResized > Set Equal To > yes). Then, also at the topmost course level, I have a runGroup to run that action group, IF, the window has not yet been resized (if var_WinResized > Not Equal To > yes). I do this so the resizing happens only once and does not attempt to resize each page.