I used the code in this post and it works for me (I'm using the Polaris/Brine template) - might be worth trying to see if it may work for you: https://answers.squarespace.com/questions/126964/turn-off-hyphenation-in-brine-template.html
adding one more comment that I just added the code above in my custom CSS (I only used h1 to stop hyphenation of headings in mobile) and it worked for me in the Polaris template, which is part of the Brine family
adding one more comment that I just added the code above in my custom CSS (I only used h1 to stop hyphenation of headings in mobile) and it worked for me in the Polaris template, which is part of the Brine family