Manual:$wgShowDiffToggleSwitch

This deprecated feature should no longer be used, but is still available for reasons of backwards compatibility. This feature was deprecated in version 1.41.0.

Miscellaneous settings: $wgShowDiffToggleSwitch
Specifies if users should see the inline switch in diff pages.
Introduced in version:	1.41.0 (Gerrit change 902539; git #360182a5)
Deprecated in version:	1.41.0 (Gerrit change 941929; git #b20ea3a5)
Removed in version:	still in use
Allowed values:	(boolean)
Default value:	`false`
Other settings: Alphabetical \| By function

Warning:

This is a temporary feature flag.