Hello BeanieBoy, that is a lovely schefflera. I think it still looks okay kept like that, I would not do any pruning right now. Typically the growth of this plant is limited by the amount of light and the amount of root area it can spread itself. Once it is repotted into a bigger container, then it will certainly grow much bigger, then it will require pruning.
If you want, reposition that plant nearer your window to get a bit more light, it may pout a bit, but it will eventually acclimate to the change.
Here was mine before, and how a change in container size will really make it bigger. As it got much bigger, that is the time we had to trim out some longer branches since it is going to hit the wall of the house.
If you do plan to repot, delay it to mid Spring when your temps are much warmer.
2011-2012
Has been repotted around 2014 and now growing by the west facing side of our side yard.
