[Zavulon]

is it possible to clean the database just on widget   "Recently added  movie".

So you are asking how to clean the Recently Added Movie widget to remove the duplicates?
Is the duplicate still in the library? If no, then just restarting Kodi should clear out and refresh the widget.

Yes you are right I need to clean the Recently Added Movie widget. I cleaned up the critical folder .All movies, on mapped drive B:, on widget Recently Added Movie was gone but smb:// links still there ...

[Zavulon]

Any way, thank you so much Karellen for your help.