Pages used to feature a number of other advanced writing tools. Many of these have been stripped out of the current version. The "Full Screen" mode (introduced in Mac OS X Lion) and supported in Pages 4.1 hid the menubar and toolbars, allowing users to focus on a single document without being distracted by other windows on the screen; however, after Pages 5, full screen mode requires the user to manually hide various panes for focused writing, and the page thumbnails pane does not automatically open when the cursor is moved to the left screen edge. Earlier versions featured mail merge, which automatically populated custom fields with contact data from the Address Book or Numbers apps to create personalized documents. For example, if a user wanted to send one letter to three people, mail merge allowed the user to create a single document with placeholder fields that were populated when printing. The mail merge feature was completely removed in version 5, although it is still doable through AppleScript. Tables and charts pasted from Numbers are automatically updated if the original spreadsheet is changed.