Development Environment

General - Synchronizing the Contents Pane with the Displayed Page

To turn synchronization off, uncheck the item Keep contents tree synchronized with displayed document, which is in Help Preferences, General. Check the item to turn synchronization on. For more information, see Contents Pane Is Synchronized with Display Pane.

PDF Reader - Specifying Its Location

Help Fonts Preferences - Specifying Font Name, Style, and Size