On the zone list in the app, disabled zone’s don’t show up. I thought something happened to my configuration and lost all of the zone information, but, when I opened the webserver,the disabled zone was still listed. Not sure if this is intended behavior or perhaps something to address in a future version of the app.
Click the lower-right corner icon (the so called footer menu) -> Show Disabled. Or, Edit Options -> App Settings -> Show Disabled. This is also explained in the OpenSprinkler user manual.