Control Weldia designer from keyboard to become more effective. Keyboard shortcuts are similar to most of other software.
Mouse wheel Up/Down … Zooming
Mouse middle click + Drag … Panning
Spacebar + Drag … Panning
Ctrl + Z … Undo
Ctrl + Y or Ctrl + Alt + Z … Redo
Dragging over objects … Select multiple
Ctrl + Click or Shift + Click … Select multiple
Ctrl + A … Select all
Escape … Deselect
Ctrl + S … Saving (automatical)
Arrows … Moving
Ctrl + Drag or Ctrl + Arrows … Precision mode
Delete or Backspace … Deletion
D … Duplication
R … Rotation 90° clockwise
+ and - … Change of overlapping
H … Horizontal flip
V … Vertical flip
Doubleclick on handle … Reset do default value