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Hi,

you can find everything in administration => Design => Positions

In the search field "Search for a hook" write header and check the option "Display non-positionable hooks"

Find Header in the list and you will see modules that use the old Header hook.

In the main module file (folder name = module name + .php) you can find the Header hook and change it to displayHeader, including the function.
After this change, the module hook will need to be registered again.

You can do it again in Design => Position ...

Hi,

you can find everything in administration => Design => Positions

In the search field "Search for a hook" write header and check the option "Display non-positionable hooks"

Find Header in the list and you will see modules that use the old Header hook.