It was/is part of the Release Management product. I believe the idea was Release would track Features to be released and the stories are grouped by the feature. This is no longer exposed in ServiceNow modules such as Release v2.
Feature is of course a key entity in SAFe and there are some organizations that are not SAFe but using Agile practices that use Feature as a way to decompose Epics. Feature is of course not formally part of or even mentioned in Scrum.
You should note that this particular table which story's Parent Feature points to is not viable out of the box to use as an"agile feature" since it does not have a parent Epic on it. It is something to be ignored unless you have a particular use case for it.
