It's not possible to hide the Main Menu from only some of your pages. The Main Menu has the same settings across all pages.

You do have the option to replace it with a secondary menu, and copy it to only some of your pages. You can create a secondary menu by using the Social stripe or the Featured stripe, and replace the icons with buttons.

To copy a stripe, click the square icon on the stripe’s manage panel. It is located on the right-side of each stripe. Then, to paste the stripe, hit a ‘+’ sign, which is located between each two stripes, and find the [Paste] option at the end of the stripes categories.