I don't see a sticky header on the English Wikipedia. Are you sure it's not a script or gadget?

@Nikki: It is only at the new Vector 2022 skin, not on the old one and not on the main page. This feature is available on other wikis like German Wikivoyage, so it is not a local gadget.

See: https://gerrit.wikimedia.org/r/plugins/gitiles/operations/mediawiki-config/+blame/8b55c520057a65ca700fd87550ee3445c237b9ae/wmf-config/InitialiseSettings.php#2439

Only a comment: Maybe it is useful to show the sticky header in any case (logged-in and logged-out users) in all wikis hiding only these icons which are not useful for logged-out users.

@Bugreporter Thank you! That leads me to T295976.

@ovasileva: Can you chime in?

Could you clarify what this bug is about?
The sticky header for logged in users is present on any Wikidata page which has a heading and has been configured for that namespace.

I see it on the following pages:

https://www.wikidata.org/wiki/Help:About_data
https://www.wikidata.org/wiki/Q1

Is this a duplicate of T329673: Enable sticky header in all namespaces or is there something specific to Wikidata in this bug report?

I assume that in InitialiseSettings.php the vector.sticky_header test enrollment was removed, and that's why sticky headers are now visible on all wikis. A month ago, Wikidata was excluded. Maybe @ovasileva can tell us about this.

It seems that the former section:

'wgVectorStickyHeader' => [
	'default' => [
		'logged_in' => true,
		'logged_out' => false,
	],
	'commonswiki' => [
		'logged_in' => false,
		'logged_out' => false,
	],
	'wikidatawiki' => [
		'logged_in' => false,
		'logged_out' => false,
	],
	'frwiki' => [
		'logged_in' => false,
		'logged_out' => false,
	],
],

is now vanished.

@RolandUnger I'm still confused. Yes the sticky header was recently cleaned up so that it applies to all projects. It was completed in T332728 on 8th January just after your task was filed.

So to confirm: Are you saying the issue is now fixed or are you requesting that the sticky header is disabled on certain pages?