It’s not “spaghetti” - you’re applying a simple Lennard-Jones model. That’s the result.
I’d suggest installing miniconda and conda install -c conda-forge openbabel for example.
More methods are in progress, but if you want to optimize using the Open Babel force fields, either install that or use the Extensions ⇒ Open Babel ⇒Optimize Geometry.
That’s why the Open Babel options still exist. The merged version doesn’t exist yet.