You can use any slide size for your Articulate Presenter courses. See this tutorial to learn how to adjust the slide size.
Bear in mind that the Presenter player (the interface around the perimeter of your slides) adds to the width and height of your published course. The number of pixels added to the overall size depends on the features you include in the player.
|None (i.e., player frame only)||+ 20 pixels||+ 20 pixels|
|Title|| ||+ 23 pixels|
|One or more topbar tabs|| ||+ 24 pixels|
|Volume controller, seekbar, or Prev/Next/Submit buttons|| ||+ 51 pixels|
|Sidebar||+ 240 pixels|| |