The size of the plot returned by df.hist() is not the desired one.

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To change the size of the plot returned by df.hist(), you can pass in the figsize parameter with a tuple of width and height values.

For example:

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

# create a dataframe with random values
df = pd.DataFrame(np.random.randn(100, 4), columns=['A', 'B', 'C', 'D'])

# plot a histogram with a custom size
df.hist(figsize=(10, 8))

plt.show()

In this example, the figsize parameter is set to (10, 8), which will create a plot with a width of 10 inches and a height of 8 inches. You can adjust these values to your desired size.