So how do I save a project?

Using the Hub I’ve downloaded the basic Platform tutorial and completed the first step of the tutorial.
When moving to the second step I’m prompted to save my changes, but I’m not given any option on where to save them.
So my project is currently saved in AppData/Temp/
This is not very useful since directories in Temp will eventually get deleted and to maintain usful organisation of my work I want my project in my Development directory.
The documentation here Unity - Manual: Save your work states that I can save Project wide changes using File → Save As, this doesn’t work. Clicking File → Save As and selecting a directory in my Development directory results in the error “The scene needs to be saved inside the Assests folder of your project”.

So how do I save my project where I want to and can we get we get the documentation updated please?

Save the project in the current location, close Unity, move the project folder to the new location, open Unity, and manually find the project in the new location. From then on the project in the new location will be in the list of known projects.