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There are several ways to resolve the issue of plots not displaying when invoked from a custom function:

1. Use the plt.show() function within the custom function to display the plot.
2. Pass the ax object to the custom function and use it to plot the data. This ensures that the plot is created on the same axis object that is displayed by plt.show().
3. Use the %matplotlib inline magic command at the beginning of the notebook cell to ensure that all plots are displayed inline.
4. Check the backend of Matplotlib and switch to a different backend. For example, using %matplotlib qt will display the plot in a separate window.
5. Check if there are any errors in the code that are preventing the plot from being created.