Sklearn plot_tree plot is too small

I think the setting you are looking for is fontsize. You have to balance it with max_depth and figsize to get a readable plot. Here is an example

from sklearn import tree
from sklearn.datasets import load_iris
import matplotlib.pyplot as plt

# load data
X, y = load_iris(return_X_y=True)

# create and train model
clf = tree.DecisionTreeClassifier(max_depth=4)  # set hyperparameter
clf.fit(X, y)

# plot tree
plt.figure(figsize=(12,12))  # set plot size (denoted in inches)
tree.plot_tree(clf, fontsize=10)
plt.show()

enter image description here

If you want to capture structure of the whole tree I guess saving the plot with small font and high dpi is the solution. Then you can open a picture and zoom to the specific nodes to inspect them.

# create and train model
clf = tree.DecisionTreeClassifier()
clf.fit(X, y)

# save plot
plt.figure(figsize=(12,12))
tree.plot_tree(clf, fontsize=6)
plt.savefig('tree_high_dpi', dpi=100)

Here is an example of how it looks like on the bigger tree.

enter image description here

enter image description here

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