In this pen, I would expect the category order to change, but it doesn't: https://codepen.io/nicolaskruchten/pen/wvMVgrE?editors=0010 Originally reported in Dash: https://community.plotly.com/t/using-transitions-in-plotly-dash-app/42744/3 _Originally posted by @nicolaskruchten in https://github.com/plotly/plotly.js/issues/5037#issuecomment-667312237_