Set Size

Selected items in the 2D View can be accurately scaled or resized using this option.

Anchor

The anchor position determines the point on your selected object's bounding box that will be resized to the dimensions entered.

Link XY

Checking ✓ this option will always scale the height and width in proportion. Leaving the Link option unchecked allows non-proportional scaling

Auto Scale Z

This option sets a specific mode of scaling for 3D Components. When it's checked, ✓ scaling a model component in X or Y will result in it also scaling proportionately in Z, as such if you increase its size in X and/or Y then its Z Height will also increase and conversely when you reduce its X and/or Y size it will shrink in height. When it is unchecked then the Z Height of your Components will remain constant regardless of any X and/or Y scaling done either within this form or dynamically using the mouse in the 2D or 3D View.

Size Interactive

The default mode is to enable selected items to be scaled interactively by clicking twice with the mouse.
The process is:

Select the vectors
Click a second time to activate the interactive options - handles on the selection box
Click and drag on the white handles

The keyboard shortcut T opens the Scale form in interactive mode.

Interactive Handles

Handle	Operation	Additional options
White Corner boxes	Scaling proportionally	Hold `Shift` for scale from middle
White Center box	Move the selected objects	Hold `Shift` for linear X or Y moves
White Middle Side boxes	Scaling non-proportionally	Hold `Shift` for symmetrical scale
Blue Corner boxes	Rotating dynamically	Hold `Shift` 15° increments

Quick Keys

For scaling objects with a specific amount without having to go into the form, the Quick Keys can be used while dragging one of the scaling handles around the object.

Dragging an edge handle, a single value is expected to determine the amount of change in that direction. This can be a relative value or an absolute value.
Draggina a corner handle, two values are expected with the new width and height of the object. Alternatively, a single value followed by S to scale relatively.

See Quick Keys shortcut table for a list of available actions.