I lost the microscope symbol

I used to see the microscope symbol. its function I like. Somehow it was replaced with a three line settings-like symbol. How do i change it back to the microscope (I never changed it so I don't know how or why it changed.)

Are you talking about correspondance games? It is in the upper bar, under the opponent's name and next to the arrows.
I am wondering what happened since I can finally use the conditional premoves in my android app since yesterday. Never worked before for me...

I’m referring to the small microscope icon. When you click on it you can recreate your played game move for move and see how many points you are ahead or behind at any given time, and how many points your game would have been if you made different moves.

Now this microscope icon is gone and I can’t replay my games or see how many points I’m ahead or behind. Please, help!

Ok, I think I figured it out. When you select zen mode the microscope icon appears. I think I had to hold my iPhone in landscape mode to see it—and when I clicked on it all the features I mentioned are available. I don’t remember messing with zen mode at all, but apparently I clicked on something somehow.