[Tocloft] Can't change title of tableofcontents about herries-press HOT 2 CLOSED

you blame the wrong package :-) this is polyglossia that prevents it. But I doubt that it has ever worked. According to the polyglossia manual

\gappto\captionsitalian{\renewcommand{\contentsname}{Sommario}}

changes the captions in your document.

\captionsitalian is executed at begin document so therefore it undoes your change. Thus a version that would have also worked is to move the redef after begin document, but this only works if you don'tt switch languages, so the right approach with polyglossia is the above.

from herries-press.

Perfect! Thank you so much!
Your suggestion solves this issue!

BTW, latest versions of Polyglossia added so many features that broke compatibility with other packages.
It's not the first time I've hit my head on problems related to polyglossia and it's not the first time that ... I blame the wrong package! 😆

Best regards and thank you very much again!

from herries-press.