How to customize plots that were made using "scikitplot.metrics" other than the arguments show in the function?

Question

I made some graphs with scikit-plot package, but need to customize the axes colors and sizes as well the lines width.

Here is what I already have plotted and the editable arguments of the function generating the plot:

skplt.metrics.plot_ks_statistic(y_train, 
random_forest.predict_proba(x_train[["out_prncp",
"int_rate","total_rec_prnc","total_pymnt"]]),ax=None, figsize=(15,7), title_fontsize="large",
text_fontsize="medium")
plt.xlim([0,0.7])
plt.title("KS Modelo Random Forest - Treino", size=20)
plt.rc("lines", linewidth=1.5, color='r')
plt.autoscale()

As show, the param arguments of matplotlib.pyplot to format are disregarded for some reason.

Just need to set the graph lines to 1.5 points of widths and black colors in the axis ticks

Quick excel hack to show the formating: