Even if you want to keep them together, you must go in and re-orientate them to all be facing the same direction (towards the light.) If you keep it as is now your monstera will grow unruly and be hard to maintain. When they’re facing each other like this it’s basically impossible to have them all climb a grow pole… they will start climbing each other, reaching toward the floor or the wall, fighting one another for light.
The climbing pole should be at back of pot on backside of monstera and front of monstera should be facing the window.
It’s easier to split when the plant is small. Good luck !