Why cant i analyze games anymore?

During a game i used to be able to click the buttons on the bottom (play, pause, skip, the stuff for seeing what moves have been played) and then enter a mode where i could put down hypothetical pieces and also put down where i thought my oponite would go. now i cant? when i click play or pause nothing happens. It was super helpful to have branching scenarios and i really want it back

See here.


See the above link posted by jlt