You need to check if right-click menu scripts are installed in your client. To do this, press the key combination "ALT+P" to open the editor and see what is there.
If your right-click menu scripts were reset and are missing, but are still in the client root folder with the name "popups.ini", then you can load them back via -> "File/Load".

If you want to create new right-click menus, then here is a description of how to do it correctly -> https://www.mirc.com/help/html/index.html?popups.html or https://en.wikichip.org/wiki/mirc/identifiers/$menu


Example for tab "Popups => View/Nick List":
Code
Info 
.Whois: /whois $$1 $$1
-

Example for tab "Remote":
Code
menu nicklist {
  Whois: /whois $$1 $$1
}


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