How to close a channel on Freenode when migrating to Libera
/msg NickServ LISTCHANS to see what permissions you have in what channels.
For each channel you have
+R and either
+t permissions in, run:
/msg ChanServ OP #channel
/msg ChanServ SET #channel TOPICLOCK OFF
/msg ChanServ TOPIC #channel We have moved to irc.libera.chat