TCAdefaults 

This allows to set or override the default values of TCA fields that is available for various TCA types, for instance for type=input.

The full path of a setting include the table and the field name: TCAdefaults.[table name].[field]

This key is also available on User TSconfig level, the order of default values when creating new records in the backend is this:

  1. Value from $GLOBALS['TCA']
  2. Value from user TSconfig
  3. Value from page TSconfig (these settings)
  4. Value from "defVals" GET variables
  5. Value from previous record based on useColumnsForDefaultValues

Example: Do not hide newly created pages by default 

EXT:site_package/Configuration/page.tsconfig 
TCAdefaults.pages.hidden = 0
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