WillC said:It looks like the main stem coming out of the soil is vertical and it is only the more recent top growth that is bending toward the light. I don't think a stake or pruning are warranted at this point. As Christine suggested, position it so that the top leaning portion is facing AWAY from the window.
It seems top heavy to you because the leaves are very large on this plant. As long as you have it in a pot large and heavy enough to keep it from tipping over, it should be fine.
Always water as soon as the surface of the soil feels almost dry.