Select a slide in the slide navigator.
Click the disclosure triangle next to Background in the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Background section, click
in the toolbar.
Click the pop-up menu below Background, then choose a fill type.
Tip: If you want the background to be a single color, choose Color Fill.
The slide background fill choices are similar to those for a shape. To learn more about fills, see Fill shapes and text boxes with color or an image.
You can quickly change the layout of a slide you added to your presentation.
Select the slide in the slide navigator.
Click the Change Master button near the top of the sidebar.
If you don’t see a sidebar, or the sidebar doesn’t have a Change Master button, click
in the toolbar.
Select a slide layout to apply it.
You can add a Master button to the toolbar, which gives you quick access to all slide layouts. To learn more, see Customize the toolbar.
You can change the theme of a presentation at any time, and all your slides inherit the attributes of the new theme, including object styles, slide backgrounds, and more. If you customized an object from the original theme—if you changed the appearance of title text on a slide, for example—that object retains its changes.
Choose File > Change Theme (from the File menu at the top of your screen), then select a new theme.
Deselect the “Keep your style changes” checkbox if you want the new theme styles to override your style changes.
Click Choose.