When I was performing Yellow Submarine lesson, I was suddenly able to extrude unconstrained. I.e., I was pressing
E, then immediatedly new set of vertices appear and I was able to translate (drag) them in any direction.
After I finished extruding to one side and turned to extruding to another side, I lost this ability. Once I press
E, new set of vertices appear, but I am able to move them only in vertical dimension. So, I press explicitly
Y and after that I am able to move vertices in horizontal dimension. But in horizontal dimension only, i.e. I am not able to finetune vertically.
Video sample https://www.youtube.com/watch?v=RV6he45jLFs
I am to stop extrusion process and adjust vertices separately.
How to call unconstrained extrusion in my case?