1. Quit QuickLook if it is running.
2. Navigate to the data location.
3. Open QuickLook.config with a text editor. If this file does not exist then run and quit QuickLook once.
   • If the file contains only one line, copy and paste the following to overwrite the content:

     <?xml version="1.0" encoding="utf-8"?>
     <Settings>
     </Settings>
     

4. Add your desired config and save the file.
   • The final config should look like this (ShowTrayIcon and UseTransparency are just for example):

     <?xml version="1.0" encoding="utf-8"?>
     <Settings>
       <ShowTrayIcon>True</ShowTrayIcon>
       <UseTransparency>True</UseTransparency>
     </Settings>
     

5. Run QuickLook again.

Default is True (show the icon).

• To hide the icon, write: <ShowTrayIcon>False</ShowTrayIcon>.
• To show the icon, write: <ShowTrayIcon>True</ShowTrayIcon> or delete the existing line.

Default is True (enable transparency).

• To disable transparency, write: <UseTransparency>False</UseTransparency>.
• To enable transparency, write: <UseTransparency>True</UseTransparency> or delete the existing line.

Default is False (disable color profile conversion). Note that enabling this feature will slow down image previewing, especially on large images.

Open QuickLook.Plugin.ImageViewer.config with a text editor.

• To disable conversion, write: <UseColorProfile>False</UseColorProfile> or delete the existing line.
• To enable conversion, write: <UseColorProfile>True</UseColorProfile>.

Default is False (do not use the dark theme for the text viewer). Note that enabling this feature will invalidate all syntax highlighting themes, i.e., no syntax highlighting is available in the dark theme.

Open QuickLook.Plugin.TextViewer.config with a text editor.

• To disable the dark theme, write: <AllowDarkTheme>False</AllowDarkTheme> or delete the existing line.
• To enable the dark theme, write: <AllowDarkTheme>True</AllowDarkTheme>.