I am trying to add perspective to a rectangle - moving the lower edge to be "further away". I would like the distort to be symmetrical about the vertical axis. I get this to work somewhat randomly - clicking the lower right-hand corner and moving it inwards. Then somehow it starts getting "offset" and I cannot get it to work symmetrically again. cmd+alt+shift doesn't do what I want. once the shape failed to distort symmetrically, I cannot get any object to work correctly - it's as if a default axis has been set somewhere.
Moving the corner up and down always behaves as expected - symmetrical perspective. Fiddling with the reference point seems to have no effect.
Thank you. I have used the perspective grid a lot my question is about the free-form transfer perspective tool not behaving as I expect. It behaves correctly then seems to stop. On my machine it behaves differently to a colleague of mine doing the same thing and a YouTube video I checked out. That's why I asked about modifier keys or preferences that might be different. I can achieve the end result I want in several ways but am asking specifically about this tool's behaviour