Default generated categories TCA misses maxLevels configuration
The default generated TCA configuration by the CategoryRegistry does not set maxLevels value.
Because this is not set only 4 levels are shown but should be set to at least 99.
Same for the parent field of sys_category itself.
Updated by Frans Saris about 8 years ago
The TCA settings done by the CategoryRegistry can not overruled easily as these are added after all TCA files (from TCA folders and ext_tables.php files) are loaded.
So when you want to override these settings you have to remove the table from "$GLOBALS['TYPO3_CONF_VARS']['SYS']['defaultCategorizedTables']" and add it your self again.