How to Change the Size and Shape of a Presentation in Keynote

Difficulty - Easy 

 Step 1 - Open The "Presentation Menu" 

 Select the presentation's title in the top left to open a drop-down menu. 

 

 Step 2 - Navigate to "Presentation Options" 

 Tap the option in the drop-down menu titled: "Presentation Options" 

 

 Step 3 - Presentation Setup 

 Select presentation setup under the "Presentation Options" menu. 

 

 Step 4 - Document Slide Options 

 On the bottom of the screen, select the "Slide Size" option to change the proportions of the presentation. 

 

 Step 5 - Choose a New Size and Shape 

 Select the size and shape desired, or create a custom one.