A thick root is creeping over your Monstera's pot. Another is heading toward the floor. Leave aerial roots that have room, gently guide those that are in the way, and assess the roots inside the container before deciding to repot. Their length alone does not call for a bigger planter.
This guide concerns Monstera deliciosa, the large-leaved climbing houseplant. Its aerial roots grow from the stem and help it attach to supports. In the wild, some grow down to the ground and root there. A root extending beyond the pot is part of that growth habit. University of Wisconsin–Madison Extension explains how Monstera climbs.
