Open your PowerPoint presentation
Click the Design tab
Select Slide Size
Choose Standard, Widescreen, or Custom Slide Size
If needed, enter custom width and height values
Click OK
Choose Maximize or Ensure Fit when prompted
Save your presentation
Open your PowerPoint presentation
Click the Design tab
Select Slide Size
Choose Standard, Widescreen, or Custom Slide Size
If needed, enter custom width and height values
Click OK
Choose Maximize or Ensure Fit when prompted
Save your presentation