When you send a request to Burp Intruder, this creates a new attack tab, which is automatically populated with details of the request.
You can use the controls on the tab header to create new tabs and make various changes to existing ones:
Switch tab view - use the tab view toggle in the top-right corner to choose from two different views:
Close tabs - you can close tabs in multiple ways:
You can send a request to Intruder from a request that is already in Intruder - a new tab is created with another instance of the same request. This can help you organize your testing.