fig.show()

In this example[itemsizing](https://plot.ly/python/reference/#layout-legend-itemsizing) attribute determines the legend items symbols remain constant, regardless of how tiny/huge the bubbles would be in the graph.

import plotly.graph_objectsas go

fig= go.Figure()

fig.add_trace(go.Scatter(

x=[1,2,3,4,5],

y=[1,2,3,4,5],

mode='markers',

marker={'size':10}

))

fig.add_trace(go.Scatter(

x=[1,2,3,4,5],

y=[5,4,3,2,1],

mode='markers',

marker={'size':100}

))

fig.update_layout(legend= {'itemsizing':'constant'})

fig.show()