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Any user whose tabs all belong to the same group, whether or not it is the default tab group, will not see the TabGroups feature. TabGroups automatically shuts itself off in this case. This behavior is especially desirable for the guest (unauthenticated) user, who normally has only 1-2 tabs of content.

# Whether or not to use Tab Groups (a.k.a. "Supertabs").
# This feature allows tabs to be organized into groups;  only one group of tabs 
# will be displayed at a time.  Users will experience a two-level tab hierarchy:  
# click on a tab group (top-level tab) to see the tabs in that group;  click on 
# a tab (lower-level tab) to see the portlets on that tab.
#
org.jasig.portal.layout.useTabGroups=false

<!-- IDs are unique identifiers. Your ID numbers will be different. Export your layout and re-import as stated above -->
 
<?xml version="1.0" encoding="UTF-8"?>
<layout xmlns:dlm="http://www.uportal.org/layout/dlm" script="classpath://org/jasig/portal/io/import-layout_v3-2.crn" username="sample-lo">
  <folder ID="s1" hidden="false" immutable="false" name="Root folder" type="root" unremovable="true">
    <folder ID="s2" hidden="true" immutable="true" name="Header folder" type="header" unremovable="true">
      <channel fname="fragment-admin-exit" unremovable="false" hidden="false" immutable="false" ID="n3"/>
    </folder>
    <folder ID="s4" hidden="false" immutable="false" name="Footer folder" type="footer" unremovable="false"/>
    <folder ID="s16" hidden="false" immutable="false" name="My First Sub Tab" type="regular" unremovable="false">
         <structure-attribute type="folder">
                <name>tabGroup</name>
                <value>Sample Tabs</value>
        </structure-attribute>
        <channel fname="my-portlet1" unremovable="false" hidden="false" immutable="false" ID="n62"/>
    </folder>
    <folder ID="s21" hidden="false" immutable="false" name="My Second Sub Tab" type="regular" unremovable="false">
          <structure-attribute type="folder">
                <name>tabGroup</name>
                <value>Sample Tabs</value>
          </structure-attribute>
          <channel fname="my-portlet2" unremovable="false" hidden="false" immutable="false" ID="n65"/>
    </folder>
   <folder ID="s22" hidden="false" immutable="false" name="My Third Sub Tab" type="regular" unremovable="false">
        <structure-attribute type="folder">
                <name>tabGroup</name>
                <value>Sample Tabs</value>
        </structure-attribute>
        <channel fname="my-portlet3" unremovable="false" hidden="false" immutable="false" ID="n68"/>
    </folder>
    <folder ID="s23" hidden="false" immutable="false" name="My Fourth Sub Tab" type="regular" unremovable="false">
         <structure-attribute type="folder">
                <name>tabGroup</name>
                <value>Sample Tabs</value>
        </structure-attribute>
        <channel fname="my-portlet4" unremovable="false" hidden="false" immutable="false" ID="n71"/>
    </folder>
  </folder>
</layout>