"... you should be using use (changes that shell only), ..."
use is an option; not a requirement.
Fix with: s/should be using/can also use/ (or similar).
"... not switch (changes all shells)."
That's incorrect.
Fix with: s/changes all shells/changes subsequent shells/ (or similar).
Below, I show starting two shells both using 5.34 —
I change to 5.32 in the second shell; the first shell remains at 5.34;
after that I start a third shell which uses 5.32.
$ # Shell A
$ perlbrew list
* perl-5.34.0
perl-5.33.5
perl-5.32.0
perl-5.30.0
$ # perlbrew switch in Shell B
$ perlbrew list
* perl-5.34.0
perl-5.33.5
perl-5.32.0
perl-5.30.0
$ # Shell B
$ perlbrew list
* perl-5.34.0
perl-5.33.5
perl-5.32.0
perl-5.30.0
$ perlbrew switch perl-5.32.0
$ perlbrew list
perl-5.34.0
perl-5.33.5
* perl-5.32.0
perl-5.30.0
$ # Shell C
$ perlbrew list
perl-5.34.0
perl-5.33.5
* perl-5.32.0
perl-5.30.0
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