I had already attached a screenshot. Anyway I double checked now and the button to close the 'Preferences' window now appears and works, as you can see in the new screenshot that I attach. As far as I'm concerned I would consider the bug closed.
Best regards and many thanks. ** Attachment added: "Screenshot from 2021-09-15 10-06-28.png" https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1937247/+attachment/5525399/+files/Screenshot%20from%202021-09-15%2010-06-28.png -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/1937247 Title: Difficulty closing the Dialog Preferences in Nautilus Status in nautilus package in Ubuntu: Incomplete Bug description: Dear maintainer, in Nautilus 40.2 the upper bar of the Preferences Dialog does not appear, so it is only possible to close the Preferences Dialog by pressing the ESC key on the keyboard. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1937247/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp