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Oxygen XML Editor lets you configure the appearance of various components and features of the main editor. To access these options, open the Preferences dialog box (Options > Preferences) and go to Editor.

The following options are available:
Selection background color
Allows you to set the background color of selected text.
Selection foreground color
Allows you to set the color of selected text.
Completion proposal background
Allows you to set the background color of the Content Completion Assistant.
Completion proposal foreground
Allows you to set the color of the text in the Content Completion Assistant.
Documentation window background
Allows you to set the background color of the documentation of elements suggested by the Content Completion Assistant.
Documentation window foreground
Allows you to set the color of the text for the documentation of elements suggested by the Content Completion Assistant.
Find highlight color
Allows you to set the color of the highlights generated by the Find and Find all actions.
XPath highlight color
Allows you to set the color of the highlights generated when you run an XPath expression.
Declaration highlight color
Allows you to set the color of the highlights generated by the Find declaration action.
Reference highlight color
Allows you to set the color of the highlights generated by the Find reference action.
Maximum number of highlights
Allows you to set the maximum number of highlights that Oxygen XML Editor displays.
Show TAB/NBSP/EOL/EOF marks
Makes the TAB/NBSP/EOL/EOF characters visible in the editor. You can use the color picker to choose the color of the marks.
Show SPACE marks
Makes the space character visible in the editor.
Can edit read-only files
If this option is selected, Oxygen XML Editor will let you edit read-only files. When you try to save them, a Save As dialog box will be displayed to avoid overwriting the initial resource. If the option is not selected, a warning message is displayed when you try to edit a read-only file.
Display quick-assist and quick-fix side hints
Displays the Quick Assist icon () and Quick Fix icon () in the line number stripe on the left side of the editor.
Undo history size
Allows you to set the maximum amount of undo operations you can perform in any of the editor modes (Text, Author, Design, Grid).
Enable mouse-wheel zooming
If selected, you can use Ctrl + MouseWheelForward (Command + MouseWheelForward on OS X) to increase the editor font (zoom in) or Ctrl + MouseWheelBackwards (Command + MouseWheelBackwards on OS X) to decrease the editor font (zoom out). It is enabled by default on Windows and Linux, while it is disabled by default on Mac OS X, due to the way inertia affects the mouse wheel on this operating system.