Type text within PowerPoint—and its font type and size are decided for you, based on the Theme applied to your presentation. For example, if you use PowerPoint’s default Office Theme, then all your typed text will sport the Calibri typeface. You can quickly change the Theme Fonts set altogether for your presentation, and all text instances will switch to the default typefaces of the new Theme or Theme Fonts set. However, there may be times when you want to override these defaults and choose a typeface that is different, or even a different font size.
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