This happens in Editor X and the regular Editor.
WIX chat support mentioned that hyphenation is currently not available.
But is there a workaround using code?
It’s important to mention that the word is only broken on mobile because it doesn’t fit on one line. It works on one line on all other breakpoints and doesn’t need to be hyphenated.
A workaround might be placing two text elements for the title, then hiding the one from the mobile on the other breakpoints and vice versa, and doing the hyphenation manually. But come on… 
I’m sure you are smarter than me.