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    Once you have registered here, then you need to start a conversation at xenforo.com w/Bob and provide the following:
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Disable "Most Showcase Items" tab from Notable Members and...

@Bob well, isn't possible to edit, add or change in a PHP file? The fact I already don't need any on/off mode to do it.

     * Displays the Showcase Most Active Members List
     * @return XenForo_ControllerResponse_Abstract
    public function actionIndex()
        $userId = $this->_input->filterSingle('user_id', XenForo_Input::UINT);
        if ($userId)
            return $this->responseReroute(__CLASS__, 'member');

        $scItemModel = $this->_getSCItemModel();
        $scMemberModel = $this->_getSCMemberModel();
        $membersPerPage = XenForo_Application::get('options')->scMembersPerPage;
        $page = max(1, $this->_input->filterSingle('page', XenForo_Input::UINT));
        $members = $scMemberModel->getMembers(array(
            'perPage' => $membersPerPage,
            'page' => $page
        $viewParams = array(
            'members' => $members,
            'page' => $page,
            'totalMembers' => $scMemberModel->getMembersCount(),
            'membersPerPage' => $membersPerPage,
        return $this->responseView('NFLJ_Showcase_ViewPublic_MostActiveMembers', 'nflj_showcase_most_active_members', $viewParams);           
As I said, it would require custom development eg, file edits, template edits, extending the addon etc. If you don't know how to do it, you'll need to hire a developer to do it for you. There are several developers that know Showcase very well that can assist you in this customization. I'd offer to do it for you, but I have 1000's of hours of XF2 development to get done.