The Default Presentation Control Panel applet allows you to specify site-wide presentation options for the blogs in your community. You can enable presentation settings for all of your blogs - such as enabling themes, setting default themes, or enabling post counts.
To set the blog presentation properties:
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Navigate to Control Panel Dashboard > System Administration > Blog Administration > Configuration > Default Presentation.

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Specify the Default Presentation page properties:
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Enable Themes - Allows users who have blogs on your Web site to select a blog theme from the available themes on the site.
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Enable Theme Configuration - Blog owners can customize their blog theme if customizable options are available for the selected theme.]
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Default Theme - Theme applied to the blog when the blog is created.
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Aggregate Post Count - Maximum number of blog posts on the blog aggregate page and blog aggregate RSS feed.
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Individual Blog RSS Post Count - Maximum number of blog posts allowed on the blog home page.
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RSS Post Excerpt Size - Number of characters from each post to display in RSS feeds that render excepts.
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Click Save to apply your settings.