Walk1 — click the view to look around with the mouse (or drag). W A S D move, Shift run, Q/E crouch and stand. On a phone use the joystick and drag to look.
Orbit2 — doll's-house view, roof off. Drag to turn, scroll to zoom, right-drag to pan.
Plan3 — top-down. Toggle the agent's floor plan overlay in Scene.
MeasureM — click points on any surface. Each segment and a running total in metres; Enter closes a loop and gives the area.
SetsB — place flats, cyc, lights, cameras, furniture, people. T move, R rotate, S scale, D duplicate, ⌫ delete. Lights really light the room; cameras can be looked through at a chosen focal length.
Scene — time of day, strip lights, grid, plan overlay, dimension lines, real measurements.
Share — copies a link that carries your current layout.