Conditional widget based on RelationManager

    public static function getRelations(): array
    {
        return [
            RelationManagers\ProposalRelationManager::class,
            RelationManagers\PartecipantsRelationManager::class,
        ];
    }

    protected function getHeaderWidgets(): array
    {
        return [
          ProposalResource\Widgets\ProposalOverview::class,
        ];
    }