Federal Reserve remains patient about next U.S. rate hike.
Is this sentence "linking verb" or "transitive verb"? I think it is VL but not quite sure about it.
It's not transitive. If it were, you could form the passive [*]"Patient is remained by the Federal Reserve." But that's no good, so it must be intransitive. (I'm unenthusiastic about the term "linking verb", but I suppose "remain" would be one.)