It'll try to latch onto a nearby taller tree...

Treelover, you could keep it snipped back, which will encourage lots of side shoots to form, creating a very full plant.

It will simply hang down if there is nothing to climb on. Most people use pothos as a hanging basket OR combination of hanging and climbing.

When my vines reach the top of their support, I wind them back down, then back up again. When it reaches critical mass, I cut off all of the tips I can find and solicit new homes for the cuttings.