Change tabs of extension in magento

etc/adminhtml/system.xml

 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
     <system>
-
-        <tab id="bobgo" translate="label" sortOrder="2">
-            <label>Bob Go</label>
-        </tab>
-        <section id="BobGroup_BobGo"  showInDefault="1">
-            <tab>bobgo</tab>
-            <label>Settings</label>
-            <resource>Magento_Config::config</resource>
-            <group id="general"  showInDefault="1">
-                <label>Settings</label>
-                <field id="enabled" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
-                    <label>Extension enabled</label>
-                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
-                </field>
-            </group>
-        </section>
-
-        <section id="general" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
-            <group id="store_information" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
-                <field id="suburb" translate="label" type="text" sortOrder="50" showInDefault="1" showInWebsite="1" showInStore="0">
-                    <label>Suburb</label>
-                    <can_be_empty>1</can_be_empty>
-                </field>
-            </group>
-        </section>
-
         <section id="carriers" translate="label" type="text" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1">
             <group id="bobgo" translate="label" type="text" sortOrder="2" showInDefault="1" showInWebsite="1" showInStore="1">
                 <label>Bob Go</label>
@@ -43,19 +17,16 @@
                     <label>Displayed Error Message</label>
                     <comment>The message displayed to the customer when no rates were available on Bob Go.</comment>
                 </field>
-
                 <field id="sallowspecific" translate="label" type="select" sortOrder="90" showInDefault="1" showInWebsite="1" showInStore="0">
                     <label>Ship to Applicable Countries</label>
                     <frontend_class>shipping-applicable-country</frontend_class>
                     <source_model>Magento\Shipping\Model\Config\Source\Allspecificcountries</source_model>
                 </field>
-
                 <field id="specificcountry" translate="label" type="multiselect" sortOrder="91" showInDefault="1" showInWebsite="1" showInStore="0">
                     <label>Ship to Specific Countries</label>
                     <source_model>Magento\Directory\Model\Config\Source\Country</source_model>
                     <can_be_empty>1</can_be_empty>
                 </field>
-
                 <field id="showmethod" translate="label" type="select" sortOrder="92" showInDefault="1" showInWebsite="1" showInStore="0">
                     <label>Show Method if Not Applicable</label>
                     <frontend_class>shipping-skip-hide</frontend_class>
@@ -76,7 +47,5 @@
                 </field>
             </group>
         </section>
-
-
     </system>
 </config>