That heart icon as you see from schema is actually a label that uses as Font Typephase, material icons so in order to change it go to https://fonts.google.com/icons and choose another icon for example changing favorite_border to lock, heart icon will be replaced by a lock
thank you, you are very kind, now I did it. My mistake is that in Google Font I took the name of the component above and not the one you indicated. Thanks
