I can't customize the preference center slots

Your software
My Mautic version is: v4.2.2
My PHP version is: 7.4.29
My Database type and version is: 10.6.7-MariaDB-1:10.6.7+maria~bionic

Your problem
My problem is:
I can’t find the preference center slots in Landing Page builder, therefore i can’t customize the slots.
I can use the slots just through the tokens, therefore is it not possible to customize them.