How do i change the default folder in WebStorm?

When I open WebStorm and click the "Open" icon, WebStorm suggests to open files from the C:\users\USERNAME directory: Screenshot

How do I change this default directory to a different one?

I have read the following post which helps to set the default directory when creating a new project: How to change PHPStorm 8 default new project location?

But it does not explain how to set the default directory when opening a project.

Thanks in advance.