[Atom] Still not work properly

[tunnckoCore]

Or I just can't configure everything as i was before few months, it was brilliant.

For example fn snippet does not work and even don't showing. Not to mention that i can't find way to disable the built in snippets. I read that it Just Works, if you have custom snippets - they override the default ones, but it seems it's not that way.

More that not work. Is there any working even?
rr, c= , cl, cls and etc...