The port should not be 443, maybe the SslPort, but even then it’s likely better to use something else.
Closing which tab? Sonarr’s settings aren’t saved automatically. If something is setting the port then the settings are saved it would update and take effect the next time Sonarr is started.
I meant the interface. When I changed the port in the config file, it didn’t reflect back in the interface. Could have been because the service was still running so didn’t pick up the change. I’m good now, though, thank you.