TYPO3 v9 has reached its end-of-life September 30th, 2021 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.
Override any page TSconfig property on a user or group basis by prefixing
the according property path with
page.. Find more information about this
in the Using and setting section.
page.TCEMAIN.table.pages.disablePrependAtCopy = 1