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Dash Debugger UI Not Showing

I am running a simple Dash app with debugger turned on but I cannot see it in my browser (e.g., the little round widget at the bottom right) and I don’t see any trace backs when I have an error.

I call app.server.run(debug=True) in __main__ and when the app runs stdout says “Debug mode: on” and “Debugger is active” and “Debugger PIN: XXX”.

I am on Firefox and tried relaxing my cookie settings (i.e., I allow third-party cookies and cookies from unvisited sites). I also don’t see it in Chrome so it must be something with my app.

Any ideas? Is there a special thing (CSS?) that I need to include in my app for the debugger to show in the browser?