If you want it bushy then leave it. But make sure you give it plenty of light. If the upper leaves block out too much light then you'll end up with a couple of spindly stems and few leaves.

By bushy, I would guess you mean side branches along the main trunk? A few things should help you guide the growth. The usual result of removing a growth tip is bifurcation. The usual result of removing a leaf is to inspire a new branch to form at that node. Cutting part of a leaf is a great way to send that signal while leaving some leaf there to continue the photosynthesis process.

I might recommend getting 2-3 Coleus plants to conduct experiments, if still out there in stores nearby. They respond in the classic way to pruning, but grow much more rapidly than something like a rubber tree. You can see the whole thing happen in a few weeks with Coleus. Do two different kinds of pruning to them, watch what happens.

There are also millions of pics out there if you use an image search to study pics of pruning, rubber tree in particular. That may show you what you need to know to get a feel for what to do/expect to get the results, eventual appearance that you want.

I never knew that cutting part of a leaf helps branching at that node. Definitely have to try! I always learn something on this forum :)

It's very fun to guide the growth of plants through selective pruning! Hope you have as much fun with it as I do. If you are able to add a pic of the tree to this discussion, you may get more interesting and useful feedback/suggestions.