Adjust directed graphs to improve the layout aspect ratio. Graphviz filters:
acyclic,bcomps,comps,edgepaint,gvcolor,gvpack,mingle,nop,sccmap,tred, &unflatten. More information: https://www.graphviz.org/pdf/unflatten.1.pdf.
unflatten path/to/input1.gv path/to/input2.gv ... > path/to/output.gv
unflatten as a preprocessor for dot layout to improve aspect ratio:unflatten path/to/input.gv | dot -T png path/to/output.png
unflatten -?