ken@titan ~/tmp
$ cpan
...
cpan[1]> install CPAN
...
  ANDK/CPAN-2.36.tar.gz
  /usr/bin/make install  -- OK

cpan[2]> q

$ perl -MCPAN -E 'say $CPAN::VERSION'
2.36

$ cpan -v
/home/ken/perl5/perlbrew/perls/perl-5.36.0/bin/cpan script version 1.678, CPAN.pm version 2.36

ken@titan ~/tmp
$ cpan
...
cpan[1]> o conf urllist
    urllist
        0 [https://www.cpan.org/]
        1 [https://cpan.metacpan.org/]
...
cpan[2]> q

$ ls -l ~/.cpan/CPAN/MyConfig.pm
-rw-r--r-- 1 ken None 2286 May 31  2022 /home/ken/.cpan/CPAN/MyConfig.pm

$ grep urllist ~/.cpan/CPAN/MyConfig.pm
  'urllist' => [q[https://www.cpan.org/], q[https://cpan.metacpan.org/]],

$ perl -v | head -2 | tail -1
This is perl 5, version 36, subversion 0 (v5.36.0) built for cygwin-thread-multi

$ which perl
/home/ken/perl5/perlbrew/perls/perl-5.36.0/bin/perl

$ which cpan
/home/ken/perl5/perlbrew/perls/perl-5.36.0/bin/cpan