If you use the transaction filter in an investment or brokerage account, it searches most fields, but not the category.  I thought it searched the Security, but that may be just because that string is also in the memo.  This would be very useful for me in finding transactions where the category does not match what it should be, based on the memo.  (I have "dividends" and "foreign dividends", but no easy way to filter on transaction with just "dividends" in the memo, but "foreign dividends" as the category.  I know I can use a transaction search, but I'm hoping for something more streamlined, as this is only ever for one account at a time.