From this page you can select the number of properties that display per page when viewing 1-line summaries.

1. Select Settings from Settings and Sign-Out menu in the upper right hand corner of the navigation menu bar.
2. Click the Search & report defaults link under My Defaults.
3. Under Number of properties displayed on a single page in 1-line summaries, select the number of properties to display every time you view your results on the 1-line summary page.
4. When finished, click Save.