I want to move the vertex in this direction
But it won't let me. I can move it in the X and Z axis but not the Y, like the plane is stuck being 2D and won't enter the third dimension.
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Sign up to join this communityIt's probably because the scale of that object is all over the place, including the Z scale being zero! In Object mode, apply the scale with Ctrl-A > Scale and you'll find that it works fine.
You deliberately set the scale of Z to zero which in reality does not exist. Set it to a non-zero value.
Alt+H
to reveal everything coz i was thinking it was hiding XD $\endgroup$