The page is available only when the LiveEdit plugin is installed and enabled. The plugin is not bundled with IntelliJ IDEA, but it can be installed from the JetBrains plugin repository as described in Installing, Updating and Uninstalling Repository Plugins and Enabling and Disabling Plugins.
|Highlight current element in browser on caret change||When this check box is selected, the browser highlights the area that represents the code you are currently editing in IntelliJ IDEA.|
In this area,
configure the way changes made to the code during a debugging session are applied.
Note that an update will now be performed only if none of the modified files have any syntax errors.