Problem on https://docs.typo3.org/m/typo3/reference-coreapi/13.4/en-us//ExtensionArchitecture/HowTo/BackendModule/CreateModuleWithExtbase.html

[metapublic-gbr]

The examples given on this page must be incomplete. Trying to follow the given examples as exactly as possible in TYPO3 13, a docheader never shows up in the backend.

Some vital information must be missing.

Maybe the docheader has to be enabled? Maybe a rendering component is missing in the template?

Is there a standard like this:
<f:if condition="{docHeader.enabled}">
<f:render partial="DocHeader" arguments="{docHeader:docHeader}" />
</f:if>

Then it should be included in the template...