How can I switch the text charset?

[paolosezart]

How can I set the encoding when saving and/or opening text files?
How is this done, for example, in the Notepad3 program:

I have read the documentation and did not find an option to choose in which encoding I want to save the file. And most importantly, how to switch the text charset in an already opened file?
Thanks!

[AndrewDDavis]

It looks like this is done using the encoding setting. You would use the set command to change the setting permanently, or setlocal to change it for only the current file. E.g. setlocal encoding "utf-8". Details here.