The ribbon button only opened SettingsForm while the archive folder was unconfigured - once saved once, there was no way back into settings (domain, templates, sender account, signature path) short of breaking the saved folder path. Added a "Настройки..." button to PreviewForm that reopens SettingsForm and rescans with the reloaded settings afterward. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>