Writer has the option to search for formatting in the extended "Find & Replace" dialog window called "Format...". For example, with that the user can search for a color that is assigned to text.
This feature is missing in the extended "Find & Replace" dialog window of Calc. But there it would be also useful.
Valid enhancement request, with this restriction:
UI: Searching for formats does not find conditional formats
Status: RESOLVED WONTFIX
Best regards. JBF