[Python] How to flatten column headers in a Python geopandas.geodataframe.GeoDataFrame object?

when I run nodesA.head(), I can see this object has a multi-dimensional hierarchy of headings. I have tried to flatted it by using drop level and flatten as shown in the commented out lines. How can I remove the multidimensional nature of the headings?

import osmnx as ox
import pandas as pd
G_tester = ox.graph_from_place("New York, New York, USA", network_type="drive")

nodesA = ox.graph_to_gdfs(G_tester)[0]
#print(type(nodesA))
#print(nodesA)
# nodesA['osmid']
nodesA.flatten(().head())
#nodesA.columns.droplevel()
#nodesA.index = nodesA.index.droplevel(2)
#print(nodesA.index)

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