Hi & welcome! If you like it how it is, nothing is necessary.
If you want a more upright, symmetrical plant, you could trim the stems where they stray from the boundaries that you imagine this plant observing. You can stick the removed pieces into the same pot to help add more mass to the other side (assuming they take root) or into another pot. Remove enough leaves from the bottom (cut end) of the removed pieces so that there is at least 6" of leafless stem to stick into the soil.
The reason this plant is so sideways is because it was in a single position for a long time, growing to fit the site and available light. It's difficult to maintain round-ness and symmetry for indoor plants, but if you want to aim in that direction, turn your plant every week or two, so it doesn't develop a lean toward the light.
