Here are three pruning approaches to use.
1.Remove up to one third of the outer growth on all the stems and branches. This will shrink the overall canopy of the tree by one third. This approach will yield a smaller and fuller ficus tree. It is great for ficus trees that have outgrown their space.
2.Selectively prune back up to one third of the longest individual stems and branches into the center of the tree. This will open up the center portion to more light. The cut back stems will now produce new growth and fill in the sparse center area. When done regularly, this technique will maintain the existing size of the tree without making the pruning obvious.
3.Combine the first two.
Pruning ficus trees is as much art as it is science – like cutting hair. Try to visualize how your tree will look with certain branches cut back and also how it will look as the new growth comes in. I have successfully pruned back ficus trees enough that there was not a single leaf remaining. In time I had a beautiful tree with all new growth. Plunge in and have fun!