I think that feature may be broken for open loop. I'm hoping to have a new version in a few weeks and will make sure that feature works again.
For the moment to determine the engine operating point you can use the throttle/rpm tacho display that is enabled with switch 3 in the ECU.

The o2 voltage input can be quite noisy. The most important thing is how the MyECU responds to it. There shouldn't be much variation in the closed loop correction - a few percent.

Of course before enabling closed loop you should make sure that you have appropriate target voltages in your map.

I've released the next Android Optimiser version which has the fix for tracking open loop.

It is where you got the previous version.
http://www.myecu.biz/MyECU/AndroidOptimiser/index.html
If your are not seeing it try hitting F5 to refresh the page