The component code is as below:
<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes" access="global"> body here.</aura:component>
Salesforce Stack Exchange is a question and answer site for Salesforce administrators, implementation experts, developers and anybody in-between. It only takes a minute to sign up.Sign up to join this community
You can't. It will always appear as long as you're in the Lightning Experience. If you're using a Lightning App, it wouldn't ordinarily appear.
You can't remove the Salesforce header from the Lightning Experience but as @sfdcfox mentioned you can create your own Lightning application with a dedicated URL.
Access your app via this url:
Navigating to Lightning app (Standard app) does give you the full page experience, but the caveat is now you cannot use tags like e:forceeditrecord. And using the Standalone app will do no good, as the Salesforce tabs do not go away.