If I click on one of my Investment accounts and then click on the Tools menu the Recategorize menu item is greyed out (and so cannot be used).
If I click on one of my Banking accounts and then click on the Tools menu the Recategorize menu item is enabled.
If I use the Recategorize menu item to search for a category used in Investment accounts it finds those transactions, and I can replace those categories with others.
So, why make me move over to a banking account to recategorize Investment account transactions?