This example from the docs, shows how to define the category orders: ``` import plotly.express as px df = px.data.tips() fig = px.bar(df, x="day", y="total_bill", color="smoker", barmode="group", facet_col="sex", category_orders={"day": ["Thur", "Fri", "Sat", "Sun"], "smoker": ["Yes", "No"], "sex": ["Male", "Female"]}) fig.show() ``` And renders like this:  The same example run with plotly built from master branch, only shows the bars for Sunday: 