Seehttps://github.com/plotly/plotly.py/blob/master/plotly/tools.py#L1336. Large font leads to overcrowding when plotting multiple subplots with titles.

It would be better to havemake_subplots accept akwargs parameter likefont_size=8 or, more general, to have akwargs parameter likefont=graph_objs.Font(size=8, color=...)