Hey,
I see what is happening now I think. When you set Gravity to 0 and then set the location of the character, it will instantly move the character to that position - since there is no gravity, the character doesn’t move and stands still in the position (if you were to move via input at all once in the position, the character would begin floating).
I suppose what you could do is after setting the position and gravity to 0, you could launch the character in any direction (I moved forward a bit) to give them the floating you are after (see below).
-W