Shogun can usually display your header and footer, but don't worry if it's not showing up; it will show up on the live page.
Oftentimes, you just need to make sure that you've entered your storefront password or your preview code in the Settings. We have a couple of articles below to help you find these,
Note: BigCommerce stores in the pre-launch status will also have to disable reCaptcha on the pre-launch login page. This option can be found in the Security & Privacy settings of your BigCommerce account.