For me, as long as the reading area is large enough ADE automatically gives two page view (or even three).
Maximize the ADE application, and hide the navigation pane (ctrl-T)
It appeaars that "two page" views aare not available in ADE v. 188.8.131.52765. Through chat/supuport, v. 1.7.2 was downloaded and installed and that version does allow two page viewing.. Maximizing ADE and hiding the navigation pane does not help in v. 2.0.1. Maybe this is a "problem" that needs to be readdressed in v. 2.0.1.
Odd. I generally prefer v1.7.2 because it has many fewer bugs than v2.0 or v2.0.1
However, I can see two pages even on ADE v. 184.108.40.206765.
I can't think of anything else to suggest for you (other than to keep with 1.7.2).