Modifying your page title improves the visibility of your website by search engines. Here's how you can customize it in your Page settings.
1. Navigate to the main menu.
2. Click on Pages... link.
3. From the list of your website pages, choose the one you plan to edit and click on the Gear icon to open Page Settings.
4. Edit the Page title the way you want it to be seen in search results:
The average length of page titles in search results is currently 83 characters, however, the optimal page title is 55 characters which should display your title in full on most devices without truncating.