How to: Change the size of a slide.
Solution:
Select 'Slide Setup...' from the 'File' menu and select the desired size.
1) Select the 'File' menu and select 'Slide Setup...'. (The 'Slide Setup' dialog box appears.)
2) Select the desired size from the 'Slide Sized for' drop-down list box.
select the size
3) (Special Case) If 'Custom' was chosen in step 2):
a) Type the desired width in the 'Width' box.
type width
b) Type the desired height in the 'Height' box.
type height
4) Click 'OK'. (The slide size changes to the selected size.)