Why DOpus not shows the "My Documents", "My Videos", "My Musics", and "Downloads" folder in my user folder if I change it from the default place? but it still shows in the folder tree view.
The folder tree shows the "virtual" view of the User folder, where the Documents, Videos, etc. folders are still below the User folder even if you have moved them from their default location.
The file display shows the actual C:\Users<username> folder, and only the things which are really below it.
(We might change this in future so that the file display shows the virtual folder, as we do for things like the Desktop folder, but that's how it works right now.)
Is there any news for this?
No, things still work the same way.
You could create a shortcut to the folder to get what you want, though.