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As per https://matplotlib.org/3.5.0/api/font_manager_api.html#matplotlib.font_manager.FontProperties
Arial
is not a valid font family with the only options being'sans-serif' (default), 'serif', 'cursive', 'fantasy', or 'monospace'
The invalid input doesn't raise an error and instead fails silently with a warning message which is visible in the notebooks
![image](https://private-user-images.githubusercontent.com/5949112/299466943-1b577be9-c2ea-49a2-9b72-9b78c74b660c.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.YLOx-E0r9NskTI7nDo_9rPXg_tE-g1GItlRe4C_olDs)
As per https://github.com/matplotlib/matplotlib/blob/f0c4c41d1a08bc3f53824cddc8fef7f88fc52a43/lib/matplotlib/mpl-data/stylelib/seaborn-v0_8.mplstyle#L18 Arial is part of the
sans-serif
family which is the default