Google Sites Pages have settings options. You can select and change options at any time.
To view and/or change Page Settings:
Notice the line near the bottom which reads 'Currently using page template Web Page (change). Yes, you can change the template - there are a few standard templates to choose from. Select the best template for the type of content you wish to share on that page.
To learn more about templates and what they do, visit: http://support.google.com/sites/bin/answer.py?hl=en&answer=98216