As I tried to say in my first reply to you, going higher than Jupyter starts in the file navigator seems to be a problem. You’d need to start Jupyter in /home.
The links in my first post will tell you how to potentially change things to do that. You’d know better since it is your machine and you set up Jupyter on it.
As for the notebook in the screenshot…
I specifically mention in my first reply using %cd. Note the symbol there is the percent sign that means the magic symbol and not the exclamation point you seem to use in your notebook. They are very different.
I explain it more here. It boils down to:
In short, you want to use the magic cd command, documented here, in cells when working in Jupyter.
So what you say (quoted below) is not accurate because you weren’t trying correctly: