resize mobile navigation text to make smaller

Hi, Hope all is well with everyone:) I have a question and i'm hoping someone can help. I'm using the Essex template and have created a website but  on the mobile view the menu is way too big. How can I make that smaller? I've created several squarespace websites before and never had this problem before. If i had known this was an issue i would never have used this template. If anyone could tell if there's a code just to make that smaller i would greatly appreciate it. many many thanks!

Can you share link to your site? We can check easier.