Attention
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Verifying the TCA
You may find it necessary – at some point – to verify the full
structure of the $GLOBALS
in your TYPO3 installation.
The System > Configuration module makes it possible to have an overview of the
complete $GLOBALS
, with all customizations taken into account.
Note
The Configuration module is part of the lowlevel system extension. In Composer mode
you can install it with:
composer req typo3/cms-lowlevel

Checking the existence of the new field via the Configuration module
If you cannot find your new field, it probably means that you have made some mistake.
This view is also useful when trying to find out where to insert a new field, to explore the combination of types and palettes that may be used for the table that we want to extend.