>it's almost impossible to build a nice presentation in Jupyter, because you always have to show your code and its stderr. You should be able to see a blue ver

>it's almost impossible to build a nice presentation in Jupyter, because you always have to show your code and its stderr. You should be able to see a blue vertical bar to the left of every code cell. Click that bar to collapse the cell. You can do this for both the code and the output. I know this works for Jupyter Lab, but I don't know about legacy notebooks.