This is weird because the toolbar, tray and panel settings are not in the "SharedPreferences.json" file.
But again the "File Locations" are also not in the "SharedPreferences.json" file.
You can open (and edit) JSON files in any good code editor such as Notepad++ or MS Visual Studio Code. (Both are free)
Sure but the username and folder structure must be the same on both computers.
Discussion in the other topic: