If I got what you meant by your question, when you select a Label (I assume you mean a Text Object), you could use the pulldown menu Format -> Object Size and Position to do what you want. Similarly, you could have access to the same feature by using the context menu (right-click mouse menu).
Also, you can manually do the resizing and moving using the mouse, the simplest way, but sometimes it does not work 100% properly.
Were I able to answer your question?