I saw this question, but in 2.8 the camera settings just looks like this:
How do I switch the camera to be in orthographic mode?
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It's not available in EEVEE. You have to switch to cycles render for ortho camera.
Ok, I think I've pretty much confirmed this was a bug in the beta version that I had downloaded. I downloaded a newer beta (build date is February 17th, 2019) and opened up my project and when I went to the lens settings, I was able to see all of the settings and set the camera to orthographic mode.