In PowerPoint Slide Master view lets you edit all slides at once. Use the Slide Master PowerPoint feature to ensure a consistent look.
You can use Slide Master view to modify any slide layout in your presentation. It's easy to make small tweaks like adjusting background graphics and more significant changes like rearranging or deleting placeholders. Unlike the Slide Master, changes to a slide layout will only be applied to slides using that layout in your presentation.
In our example, our newly added logo overlaps a background graphic in the Content with Caption Layout. We'll customize this layout to make room for the logo.
To add a new slide with the customized layout, click the bottom half of the New Slide command, then select the desired layout.
You can also move placeholders on the Slide Master, which will move the placeholders on multiple slide layouts at the same time. However, some slide layouts may still need to be adjusted manually.
You can also customize the text formatting from Slide Master view, including the font, text size, color, and alignment. For example, if you wanted to change the font for every title placeholder in your presentation, you could modify the master title style on the Slide Master.
Each title placeholder is connected to the master title style on the Slide Master. As you can see in the example below, modifying the font on the Slide Master changed the title font on each slide.
Rather than customizing individual placeholders, you could change the theme fonts for a presentation. From the Slide Master tab, click the Fonts command in the Background group, then select the desired fonts.