[Python] Python Marimo Slider not Showing

I was basically following the first few minutes of this video: https://www.youtube.com/watch?v=dbPj3GOFa-g

In other words I did in gitbash:

uvx marimo --help


Then:

uvx marimo edit --sandbox notebook.py


Then inside mmarimo first cell:

import marimo as mo


and in the second cell:

mo.ui.slider(1,10,1)


So, there's no error and nothing breaks. Actually, I can save that to an object called x , and then call x.value and I can see the value printed. But, there's no actual slider:



I'm using windows 11, and the browser is Microsoft Edge (I also tried with google chrome). I also tried:

uv add "marimo[recommended]"


as per the documentation: https://docs.marimo.io/getting_started/installation/#__tabbed_2_2

Any ideas?

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