The XML/HTML/Markdown branch under Configuration - Editor has the following options:
Display XML/HTML tag highlighting
If this option is selected the text within matching XML/HTML elements will be highlighted using the color specified for Tags under the Editor tab in the Manage Themes dialog. The editor will determine what files are XML/HTML files based on the extensions specified in the appropriate wordfiles.
Automatically close XML/HTML tags
If this option is selected a close tag will automatically be inserted into the file being edited when the open tag is completed.
Position close tag on separate line
If this option is selected, the close tag will be inserted on a separate line rather than the same line as the open tag. This option is subdued if the option above is not selected.
HTML preview
Update HTML/markdown preview as you type
If this option is selected, text typed in the source pane will be updated in the browser view in real time. If this is not selected, changes will not be reflected in the browser view until the source file is saved.