Since I upgraded to 6.3.2, I use XML Tools.
- install XML Tools via the Plugin Admin (Plugins → Plugins Admin… Then search for “XML Tools”, check its box and click the “Install” button).
- use the shortcut Ctrl+Alt+Shift+B (or menu → Plugins → XML Tools → Pretty Print)


In older versions: menu → TextFX → HTML Tidy → Tidy: Reindent XML.
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