You did it wrong. Anya’s world is upside down with this intruder. “Just see what happens” is not healthy or safe. Accept that and move past it.
As another comment mentions, Jackson Galaxy has a good many videos on this topic, but the first priority should be the vet to check them out for a chip and health. Then watch the JG vids.
Remember: cat’s most important security is derived from familiar territory. Move even one piece of furniture and they need to reassess. A new un-neutered male is a direct threat to the territory and can cause many unwanted behaviors and stress on both cats.