is it a bug or not i dont know? if i set highlight all matches in preferences search tab, then this will only highlight all search matches when doing simple find word search. If i go to advance search options and do Match all word search , there is no highlight of all search matches. if its not a bug then kindly add this feature in advanced search as well. i think it would be easy for developers as well and would be a great feature as well for advanced search. Couldn't find the solution. My version is acrobat pro.