Let’s discuss how to use force: lightningQuickActionWithoutHeader .The force: lightningQuickActionWithoutHeader interface to a Lightning component to allow it to be used as a custom action in Lightning Experience or the Salesforce mobile app. You can use these components as object-specific or global actions in both Lightning Experience and the Salesforce mobile app.When used as actions, components that implement the force:lightningQuickActionWithoutHeader interface display in a panel without additional controls. The component should provide a complete user interface for the action. If you implement force:lightningQuickActionWithoutHeader,  you can’t implement force:lightningQuickAction within the same component. Here we are creating the quick action that will allow the user to take the ownership from the case queue.

Apex Class

Lightning Component 

Now go and create an action on the case object like as shown below.

Add the Action to the page layout as shown below


now go to the case and click on the case ownership action that will looks as shown below  panel without additional controls