Hello mabu, thank you for your reply.
As I wrote, if you click on the LINK icon/button to transform a text in hypertext, in the little panel (screenshot), the OK button doesn't work. I insert the url and... the button OK is dead.
Typesetter version 5.1.
CKeditor the version downloaded with Typesettercms 5.1 (I didn't install update or plugins).
Websites are on server using php 7.4 or higher. But I dont think the problem is the server. The problem is the browser. I'm experiencing this on Safari but not on Google Chrome (Mac OS: Monterey 12.4).
Maybe could I update something on Ckeditor?
Thank you for suggestions.