Ashish,
Thank you for working with CodeMix.
Code folding is not yet supported in CodeMix editors, but the dev team is looking at it for a future release. I am afraid I do not have a schedule for it right now but will keep you posted when we have more details about the release.
Apologies for inconvenience caused. Please let us know if you see any other issues with CodeMix.
–Swapna
Genuitec Support