Hide some menu items from the single sites of my network

Hi there guys.

I have this project (marketplace where artists can sell their designs made products) , where I need the following:

1) Give the artists a single site (ex: artist.levantateyestampa.com) and give him ONLY the chance to customize the theme (chosen theme: Storefront by Woocommerce).

Is it possible or you may say I'm a dreamer?!

Thanks in advance GENIUSES :slight_smile: