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Alright -- next thing you could try. All those thing on the left are referred to as PanelCategory classes. Liferay like to help us out by using a standard naming convention so I am willing to be that the thing you are looking at is this class -

package com.liferay.product.navigation.site.administration.internal.application.list;

import com.liferay.application.list.BaseJSPPanelCategory;
import com.liferay.application.list.GroupProvider;
import com.liferay.application.list.PanelCategory;
import com.liferay.application.list.constants.ApplicationListWebKeys;
import com.liferay.application.list.constants.PanelCategoryKeys;
import com.liferay.item.selector.ItemSelector;
import com.liferay.portal.kernel.language.LanguageUtil;
import com.liferay.product.navigation.site.administration.internal.constants.SiteAdministrationWebKeys;
import com.liferay.site.util.GroupURLProvider;
import com.liferay.site.util.RecentGroupManager;

import java.io.IOException;

import java.util.Locale;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;

/**
 * @author Eudaldo Alonso
 */
@Component(
   immediate = true,
   property = {
      "panel.category.key=" + PanelCategoryKeys.ROOT,
      "panel.category.order:Integer=300"
   },
   service = PanelCategory.class
)
public class SiteAdministrationPanelCategory extends BaseJSPPanelCategory {

   @Override
   public String getHeaderJspPath() {
      return "/sites/site_administration_header.jsp";
   }

   @Override
   public String getJspPath() {
      return "/sites/site_administration_body.jsp";
   }

   @Override
   public String getKey() {
      return PanelCategoryKeys.SITE_ADMINISTRATION;
   }

   @Override
   public String getLabel(Locale locale) {
      return LanguageUtil.get(locale, "site-administration");
   }

   @Override
   public boolean include(
         HttpServletRequest request, HttpServletResponse response)
      throws IOException {

      request.setAttribute(ApplicationListWebKeys.PANEL_CATEGORY, this);

      return super.include(request, response);
...

}

Assuming this is right, I then opened --

"/sites/site_administration_header.jsp"

and in this file I can see --​​​​​​​

<%@ include file="/init.jsp" %>

<%
SiteAdministrationPanelCategoryDisplayContext siteAdministrationPanelCategoryDisplayContext = new SiteAdministrationPanelCategoryDisplayContext(liferayPortletRequest, liferayPortletResponse, null);

PanelCategory panelCategory = siteAdministrationPanelCategoryDisplayContext.getPanelCategory();
%>

<c:if test="<%= siteAdministrationPanelCategoryDisplayContext.isShowSiteSelector() %>">
   <div class="icon-sites">
      <liferay-ui:icon icon="sites" id="manageSitesLink" label="<%= false %>" linkCssClass="icon-monospaced" markupView="lexicon" message="go-to-other-site" url="javascript:;" />
   </div>

   &lt;%
...

</c:if>

Unfortunately, the display context objects aren't services so overriding them is tricky, but you could try one of two things next.

1. Try a service override of the PanelCategory defining your own with a higher service ranking. I would then try to return nothing for the header to see if it will omit it gracefully. It might not be expecting an empty string of a null though so this might just lead to an exception.

2. Worst case scenarion, you could use a JSP Fragment and update the logic in the JSP so that it only shows the header for Administrators or something. Better yet, tie ot to a CUSTOM portal-ext property and then you can dynamically control who can see it so that if you need more than one role to see it in the future, you can easily update via config rather than code.

.. this is all assuming of course that I am pointing you to the right files!