How to remove Header and Footer in Squarespace

#1. Hover on Page where you want to remove Header and Footer and click Gear icon

#2. Click Navigation

#3. Disable both options and click Save

#4. To remove Header and Footer on Cart Page, you will need to use this code to Custom CSS box

body#cart {
  header#header, footer.sections {
    display: none;
  }
}