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 significant changes like rearranging or deleting placeholders. Unlike with 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 want to change the font for every title placeholder in your presentation, you can modify the master title style on the slide master.
Every 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 changes the title font on every slide.
Rather than customize individual placeholders, you can change the theme fonts for the presentation. From the Slide Master tab, click the Fonts command in the Background group, then select the desired fonts.