The IRCv3 tab allows enabling/disabling IRCv3 features per server.
Default - Uses the global echo-message option.
On - Always uses echo-message when available.
Off - Never uses echo-message.
Default - Uses the global STS option.
On - Always uses STS when available.
Off - Never uses STS.
Default - Uses the global server-time option.
On - Always uses server-time.
Off - Never uses server-time.
Default - Uses the global SASL login error option.
On - Always disconnects on SASL login error.
Off - Never disconnects on SASL login error.