If you don’t want the system to highlight your search term when displaying the results of your search:

Set System Preferences OPAC > Appearance > OpacHighlightedWords and NotHighlightedWords

Set OpacHighlightedWords = Don’t highlight words the patron searched for in their search results and detail pages; 

Note there is a second option within this SysPref

To prevent particular words from ever being highlighted, enter a list of words in the second value: NotHighlightedWords (separated with the pipe symbol |)