How to set the limit of pages per page in WordPress admin panel?
Since the version 2.8, this functionality is built-in in WP. This is how it's done. Go to the pages management and on the top right corner of the screen you'll see a drop down button called 'Screen Options'. Click it to expand the options menu and enter the desired limit of pages in the box.
This will also work for setting the number of displayed items per page in other parts of management, such as posts and comments.
For versions previous than 2.8, you might want to install a plugin for this task. Or better yet, upgrade your WordPress to the newest version.