The Back command (shortcut: Alt + Left arrow) is enabled in Browser View and Schema View.
In Browser View, the Back command displays the previously viewed page. The Backspace key achieves the same effect. The command is useful if you click a link in your XML document and then want to return to your XML document.
In Schema View, the Back command takes you to the previously viewed component or view. It can take you back to up to 500 previously viewed positions.