With these small lines:

with model:
    az.plot_trace(data=idata, kind="trace", legend=True, figsize=(6, 3))
    plt.suptitle("Model Trace", fontsize=20)

I can modify a bit (general title and size) the trace plot as shown below:

I am quite sure it’s also possible to modify the variable name mu (for example increase size or change the font), but I don’t see why ?

I am also quite sure it’s possible to change the plot frame by setting the two plots vertically ?

I suspect some kwargs are involved in the many parameters of the arviz.plot_trace function, but I am unsure in how to properly use these additional parameters.

Do you have some example of using plot_kwargs, fill_kwargs , trace_kwargs, or others ?

Thanks for any hint on the subject.