PowerPoint 2011 for Mac allows users to select theme from theme galleries and the default theme is set to blank presentation (White Theme) . Let us see how to set another theme as default theme other than the blank presentation (White Theme).
Step 1: Launch PowerPoint 2011 and navigate to Themes tab.
Step 2: Select the theme which you want to make as the default theme
Step 3: To make the above selected theme as default theme, click the down arrow available next Save Theme and select “Set Current Theme as Default” from the drop down list.
Now when ever a new presentation is launched in PowerPoint 2011 for Mac, it will have the above selected theme as its default theme.