The size of a figure can be changed in two ways. You can set the scale by using the edit box control in the tools panel on the left hand side of the main window (the default will be 100%). The value can be changed quickly by clicking in the box and dragging up or down. You can also rotate the mouse wheel while the cursor is over the control. Finer adjustments of 0.1 can be made using left / right dragging or the mouse wheel while holding the Shift key.
You can also change the size of a figure by dragging a red handle with the left mouse button while holding down the Alt key on the keyboard, which can be quicker. This can also be used to quickly rotate the whole figure when more than one branch of segments is attached to the orange origin node. The figure will rotate and scale around its origin point at its orange handle.
This is equivalent to enabling the figure rotation and figure scale options in the canvas toolbar
Holding down the Alt and Ctrl keys at the same time while dragging a red handle will lock the scale so that the figure will only rotate.
Alternatively, enable only the figure rotation option in the canvas toolbar.
Holding down the Alt and Shift keys at the same time while dragging a red handle will lock the rotation so that the figure will only scale.
Alternatively, enable only the figure scale option in the canvas toolbar.
Drag a red handle while holding the Alt key to rotate and scale the whole figure