Select element:Left click
Select multiple elements:Drag on canvas
Move an element:Drag on element
New anchor:alt + click
New propagator:alt + drag
New branch:alt + drag from an existing element
Delete selected element:bkspace or delete
Constrain element to shape.:Drag from pallet and drop on anchor or alt+drag from existing constraint.
Undo:ctrl + z
Redo:ctrl + shift + z
pan:space + drag
Zoom:scroll wheel