You can also open the Drawing Sheet Setup dialog from the menus.  File->Print->Drawing Sheet Setup.  You will want to do this for the cad detail you are working in since you can have different drawing sheet setups for different cad details.   Also, just to reinforce what others have mentioned, you should always draw your details at 1:1 and then scale them when you send to layout.  You should make sure the drawing sheet is setup using the paper size and scale that you plan to use 
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