Color Scheme Toggle
The visitor dark-mode switch. Shows on the site while the Dark Mode Switch is on in Theme Options > Color Scheme > Dark Mode with a placement that includes the header. It is shown in the block inserter as Canvas Color Scheme Toggle and registered as canvas-core/color-scheme-toggle.
Select the block on a page and its own settings open in the sidebar, in the panels below:
Settings
Each setting is named exactly as the block editor names it, followed by what it does and what it starts as. Where a setting carries a Shown when line, it stays hidden until that condition is met, which is the usual reason a setting looks missing from the sidebar:
Settings
StyleDefaultHeader icon
Header icon sits with the other header icons and takes their size and colour. Button is a Bootstrap button that changes colour with the scheme.
ChoicesHeader iconButton
Icons
Icon in Light SchemeDefault
bi-moon-starsShown while the light scheme is active.
Icon in Dark SchemeDefault
bi-brightness-highShown while the dark scheme is active.
Accessibility
Accessible LabelDefaultEmpty
Name announced by screen readers, which also announce whether dark mode is on. Leave empty for "Dark mode".
Style
SizeDefaultEmpty
ChoicesDefault (empty)SmallLargeShown when Style is "Button"
Button ColourDefaultDark
Used while the light scheme is active.
ChoicesPrimarySecondarySuccessDangerWarningInfoLightDarkShown when Style is "Button"
Button Colour in Dark SchemeDefaultWarning
ChoicesPrimarySecondarySuccessDangerWarningInfoLightDarkShown when Style is "Button"
Related
Every Canvas block also carries the Animation, Scroll Effects and Advanced panels, which are described in Controls every Canvas block has.
Other blocks in Header: App Menu, Header Button, Header Cart, Header Container, Header Icon Link, Header Info.

