How to set location of project files in Scrivener 3.1.3.0 for Windows

I’ve moved backup files from my filled-up C: drive to my spacious E: drive, and I found the current location of those files (Dropbox), but I can’t find any command to set the location of the project files to my E: drive. I want to save project files to the E: drive and backup those files in Dropbox. There is no option to select a folder name and path under File | Options | General | Saving.

For the current Project, use Save as… and delete the old Project from the old location.
For several existing Projects, navigate to the Project folders with the Finder/File explorer and move the entire folders of Projects to the new location (do not move the .scrvx index file without the content files in subfolders)
The location for new Projects is the location where you create them from a Project Template.