How can we add new fields in a new tab in user setting in TYPO3 - typo3

Question

How can we add new fields in a new tab in user setting in TYPO3 version 8.7?
Our problem is the creation of a new tab.
I can add new fields to personal data tab in user setting, but I need to create new fields into a new tab.
For backend admin user setting I added a new tab, but for user setting I want to try this. I have an extension and since the installation of the extension it will add-on.
I tried to create new tab in fe_user.php.
Previously I tried to change ext_tables.php, but that is not working at all.
// Add some fields to FE Users table to show TCA fields definitions
// USAGE: TCA Reference > $GLOBALS['TCA'] array reference >
// ['columns'][fieldname]['config'] / TYPE: "select"
$temporaryColumns = array (
'tx_examples_options' => array (
'exclude' => 1,
'label' => 'tx_examples_options',
'config' => array (
'type' => 'select',
'showitem' => array (
array('LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:fe_users.tx_examples_options.I.0', '1'),
array('LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:fe_users.tx_examples_options.I.1', '2'),
array('LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:fe_users.tx_examples_options.I.2', '--div--'),
array('LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:fe_users.tx_examples_options.I.3', '3'),
),
'size' => 1,
'maxitems' => 1,
)
),
'tx_examples_special' => array (
'exclude' => 1,
'label' => 'tx_examples_special',
'config' => array (
'type' => 'user',
'size' => '30',
'userFunc' => 'Documentation\\Examples\\Userfuncs\\Tca->specialField',
'parameters' => array(
'color' => 'blue'
)
)
),
);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns(
'fe_users',
$temporaryColumns
);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCAtypes(
'fe_users',
'--div--;newtab,tx_examples_options, tx_examples_special'
);
When I changed into file ext_tables.php
$GLOBALS['TYPO3_USER_SETTINGS']['columns']['copy_directory'] = array(
'label' => 'Alternative directory for saving copies',
'type' => 'text',
'table' => 'be_users',
);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addFieldsToUserSettings('copy_directory','after:lang');
then it's showing in "personal data" tab but I want new tab in user setting for non-admin user.

Answer 1

In general your code looks fine.
But you are in the wrong file!
Avoid ext_tables.php if possible.
If you change anything to the TCA you should do it in Configuration/TCA/ for new tables and Configuration/TCA/Overrides for enhancing existing tables.
Use filenames according to the table you are modifying.
In your case all the code should be located in Configuration/TCA/Overrides/fe_users.php.
And be sure you clear all caches if you develop anything with TCA!