fieldWizard 

Specifies wizards rendered below the main input area of an element. Single type / renderType elements can register default wizards which are merged with this property.

For example, type='check' comes with this default wizards configuration:

protected $defaultFieldWizard = [
    'localizationStateSelector' => [
        'renderType' => 'localizationStateSelector',
    ],
    'otherLanguageContent' => [
        'renderType' => 'otherLanguageContent',
        'after' => [
            'localizationStateSelector',
        ],
    ],
    'defaultLanguageDifferences' => [
        'renderType' => 'defaultLanguageDifferences',
        'after' => [
            'otherLanguageContent',
        ],
    ],
];

TYPO3 merges this configuration with the configuration from TCA. To switch off a default wizard, set its disabled key to true . To switch on a wizard that is disabled by default, set disabled to false .

The render type selectSingle comes with the wizard selectIcons disabled. The location field of a conference switches it on, so it shows the images of the locations:

<?php

use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;

defined('TYPO3') or die();

ExtensionManagementUtility::addTCAcolumns('tx_myextension_conference', [
  'location' => [
    'label' => 'my_extension.db:conference.location',
    'config' => [
      'type' => 'select',
      'renderType' => 'selectSingle',
      'foreign_table' => 'tx_myextension_location',
      'items' => [
        ['label' => '', 'value' => 0],
      ],
      'fieldWizard' => [
        'selectIcons' => [
          'disabled' => false,
        ],
      ],
      'relationship' => 'manyToOne',
      // Venues only, not their halls
      'foreign_table_where' => 'AND {#tx_myextension_location}.{#parent} = 0 ORDER BY tx_myextension_location.name',
    ],
  ],
]);
ExtensionManagementUtility::addToAllTCAtypes(
  'tx_myextension_conference',
  'location',
  '',
  'after:conference_date',
);

It is possible to add own wizards by adding them to the TCA of the according field and pointing to a registered renderType, to resort wizards by overriding the before and after keys, to hand over additional options in the optional options array to specific wizards, and to disable single wizards using the disabled key. Developers should have a look at the FormEngine docs for details.