zhiker,
Ctrl+Shift+F is the keybinding for formatting in CodeMix editors.
We do not currently bundle XML formatter. You can look for an extension for XML formatting, example : this one or this one
Download the .vsix file for the extension, go to Help > CodeMix Extensions and install it using the Install from VSIX file
link. Reload the CodeMix when it prompts to and format the XML file using Ctrl+Shift+F. Further customization for XML is available here : Window > Preferences > CodeMix > Extensions > XML Configuration
.
I will file a request with the dev team to include XML tools with CodeMix.
Hope this helps. Please let us know if you see any issues.
–Swapna
Genuitec Support