Changed in version 12.0: Due to the integration of EXT:recordlist into EXT:backend the namespace of
link handlers has changed from
For TYPO3 v12 the moved classes are available as an alias under the old
namespace to allow extensions to be compatible with TYPO3 v11 and v12.
Page link handler configuration
Enable an additional field in the link browser to enter the uid of a page.
Enable the field with the following page TSConfig:
TCEMAIN.linkHandler.page.configuration.pageIdSelector.enabled = 1