Singularly Customizing the Appearance of all PowerPoint Slides
To access the slide master in Office 2010 or later, from PowerPoint click the View tab, and select Slide Master from the Master Views section.
For instance, to change the default font, from any slide click on the Fonts drop down menu and select a new font. The font of all text on each slide template will update.
Click on the Themes drop down menu to apply a theme to all slide templates.
Select different text levels and modify font sizing, styling, color and more so different parts of a presentation stand out.
Continue making changes to slide templates until all formatting appears as desired. When all changes have been made, click the "Close Master View" button in the ribbon menu which will save all changes. Re-visit the slide master at any time to make additional modifications to slide templates.
Start adding information and creating slides for the PowerPoint presentation. Each slide will automatically be created using the customizations made to the slide master templates.
Modifying the Slide Master in a PowerPoint presentation ensures whatever customizations are desired will be applied to all slides added to the presentation. Adjustments can be made to the presentation at any time by accessing the slide master again and applying customizations. These customizations will then be automatically applied to the presentation. Setting customizations using the slide master saves time as default fonts, colors, themes, font sizing and styling, and more only need to be set once to be applied to all other slides.
As always, customization is king, but doing something once that can be applied an endless amount of time is even more valuable!