How do I create a Perspective hallway?

i've created 1p perspective grid, because i'm trying create hallway. (1st pic) can't create other wall (2nd pic)

1 perspective grid tool, move little black widget,

2 click left side of cube draw on either walls in 1 point perspective, turns dark blue -

the lower edge of cube ''floor''.

light blue off

then use, say, rectangle tool , draw rectangle on grid, easier see if has a fill other white...

if want move rectangle , use perspective selection tool, housed under perspective grid tool in tool bar

its not intuitive , more info

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