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@gabby98 - IMO - if you have EPUB and/or AZW3 the simplest thing is to always run Polish (press 'p') immediately after you download or create a new cover.
Polish is not an optional plugin, it is part of the core functionality. But because its a fairly recent enhancement you may need to add it to your toolbars/menus in Preferences->Toolbars. By design Calibre updates do not change existing toolbars or menu's.
BR
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