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The Perspective Grid tool's left and right ground-level points move the whole grid; the left and right extents are separate (extentRight; Alt drags both, Shift goes by whole cells); a cell size widget sits up the line where the planes meet; Shift keeps a vanishing point on the horizon and the ground points and origin on one axis. The Plane Switching Widget stays put in a corner of the document window (ViewInfo/ToolContext carry the window as a ScreenFrame), takes its clicks with any tool while the grid shows (the Perspective Selection tool too while it's hidden), and 1-4 pick the left, horizontal, right and no plane. Double-clicking the Perspective Grid tool opens Perspective Grid Options (show the widget, its corner; perspective.widget.options, kept with the preferences). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>