Revert Game Window "Both Eyes"

Unity 2018 has updated the game window's view of both eyes, it now has options for single eyes as well as both eyes in a stereoscopic fashion. I need to know how to revert to Unity's previous style of game window like in 2017 where the game window rendered the combination of eyes as one screen.

I tried reopening my project in 2017 but it's not backwards compatible and haven't been able to find anything on the subject online.

Thanks for any help!