Where is this setting in Atom?

Question

atom

In general, I had an atom set up, then I reinstalled the system, I didn’t save the settings, there was one small trifle, but nice, on the left in the working field, where the numbers of the lines are, the boundaries of the functions were highlighted, what kind of setting or package?
drew with a red line what should be approximately

Answer 1

Better late than never ;)
This is an indent-guide-improved plugin.