ModifyAllowedItemsEvent 

The PSR-14 event \TYPO3\CMS\Backend\Controller\Event\ModifyAllowedItemsEvent allows extension authors to add or remove from the list of allowed link types.

Example 

EXT:my_extension/Classes/Backend/EventListener/MyEventListener.php 
<?php

declare(strict_types=1);

namespace MyVendor\MyExtension\Backend\EventListener;

use TYPO3\CMS\Backend\Controller\Event\ModifyAllowedItemsEvent;
use TYPO3\CMS\Core\Attribute\AsEventListener;

#[AsEventListener(
    identifier: 'my-extension/backend/allowed-items',
)]
final readonly class MyEventListener
{
    public function __invoke(ModifyAllowedItemsEvent $event): void
    {
        $event->addAllowedItem('someItem');
        $event->removeAllowedItem('anotherItem');
    }
}
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API 

class ModifyAllowedItemsEvent
Fully qualified name
\TYPO3\CMS\Backend\Controller\Event\ModifyAllowedItemsEvent

This event allows extensions to add or remove from the list of allowed link types.

getAllowedItems ( )
Returns
string[]
addAllowedItem ( string $item)
param $item

the item

Returns
self
removeAllowedItem ( string $new)
param $new

the new

Returns
self
getCurrentLinkParts ( )
Returns
array<string,mixed>