Tools
VSelect & edit
WDraw wall — click to chain corners, double-click or Esc to finish
RRectangular room — drag once to build four walls
DDoor — hovers onto the nearest wall
NWindow — hovers onto the nearest wall
PPolyline / site outline
MDimension line
TText label
ETape measure (does not draw)
HPan — or hold Space, or drag with the middle button
Precision
type a numberWhile drawing, type a length → Tab → angle → Enter to place an exact segment
ShiftConstrain to 0/45/90° while drawing or moving
OLock ortho permanently
SToggle geometry snapping (endpoints, midpoints, edges, alignments)
AltHold to suspend all snapping
← ↑ → ↓Nudge selection one grid step — with Shift, ten steps
Editing
Ctrl+ZUndo · Ctrl+Shift+Z redo
Ctrl+DDuplicate selection
Ctrl+C / VCopy and paste
Ctrl+ASelect everything on unlocked layers
DeleteErase selection
[ ]Rotate selection by 15°
Shift+clickAdd to or remove from the selection
View
FZoom to fit · 1 zoom to true paper scale
scrollZoom at cursor · Shift+scroll pans horizontally
GGrid · Dimensions and Room areas toggle from the top bar
Everything is stored in millimetres. Changing the display units or paper scale never alters your geometry — it only changes how measurements are written and how large the drawing prints.