The color mode switcher for (Light/Dark Theme) is always visible in the Sticky Header also when you define a module position of hidden or COM_MODULES_NONE. For Astroid Template Zero and Astroid Template Two

For my configuration with Astroid Template Zero it is coming twice in the Sticky Header when I define it in position topbar-2 or header-right like defined in Header section configuration.

See the different screenshots of the configurations.