Size
The tab is used to determine object size and rotation angle:

Object size and rotation angle are determined manually or using corresponding value editors.
When the group containing an object is resized, object behavior depends on the radio button:
Resize with Group. The radio button is selected by default. When the group is resized, the object is scaled.
Move Object without Resizing. When the group is resized, object position changes but its size remains unchanged.
See also:
Working with Formatting Dialog Box