Astratic theme has a few very useful build-in options. One of them is a turn on/off option for the footer or header that can be used from page/post edition view. Here is where to find it.
- Create a new post/page
- Go to the right side menu
- switch from block to document view
- scroll down to Astratic – Advanced
- hide default title/header or site footer
- check how does your project look like.