You can delete pages from the dashboard by selecting the three-dot menu located to the right of the page listing.
Just so you know, with this, you will only find the option to delete a page next to pages that you started in the app with us, with the 'Create New' button.
This option is not presented next to pages imported to us. Instead, you'll find the 'Revert Import' button, which is functionally similar to the 'delete' function in that it'll remove the page from our dashboard, but won't remove the same page from the eCommerce platform.