Yes, three ways. In the block editor add the Dark mode switch block — search for "dark". Anywhere a block will not go, use [dark_mode_switch]: a widget, a template, Elementor's Shortcode widget, a theme file.
Then turn on Manual placement only on the Toggle Button screen, so the floating one in the corner goes away and yours is the only one.
A header usually wants a smaller switch than the corner does. The block's settings panel has its own Style, and the shortcode takes one too — [dark_mode_switch style="minimal"] draws just the mark. The wording, colours and size still come from the Toggle Button screen.
Still stuck? Ask the developers who wrote it. We aim to reply within one business day.
