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After you are inside man, type /-xenter to search info about the -x parameter, Press n to jump to the next -x match, and N for the previous
If you just want the main entry, you can use /^ *-x to remove most extraneous matches. This works as most man pages are formatted with the entry indented with spaces.
The huge advantage of using your editor to view man pages is that you know all commands so well - navigation, copying, everything you'd like to do, you already know how.
If the pattern is found, less will start the page with it, the pattern here is 3 spaces before the parameter you are searching for. Not 100% reliable but usually works.