I saw tutorial saying, press 'S', 'Z', '0', followed by 'enter' to set selected vertices Z coordinates to "ground" (zero).
On my blender 2.83, when I do the above sequence, I see the 'scale' window open with Z= 0 (on the left bottom of my screen) but pressing does not do anything. The vertices don't move, their values stay as before. That 'scale' window does not have any confirm button either so I am not sure how to 'complete' the change.
Is there a mode of some sort that I changed by mistake or perhaps my keyboard 'enter' is non standard?