How to delete header and footer from spotlight theme in gempages

[ginbust]

So I want to build the store in Gempages because we want a customized layout, and everything fine.

I wanted to add a global style, and by doing so, I imported the Shopify theme preset in an attempt to save time. Now, I can't seem to delete the footer and the header from my Gempages editor, and I need them gone. I already deleted the preset and the page, but when creating a new one, it still appears. Please help me.