成唯識論述記 9.586

9.586

述曰：「現前界」者，謂下界，即欲界，現於欲界入見道故；上二界名「不現前」。

The Commentary states: 'The present realm' refers to the lower realm, namely the desire realm, because one enters the path of seeing while present in the desire realm; the two higher realms are called 'non-present'.