In Launch, I setup Rules to have a custom HTML code which needs to be in HTML <head> element.
When I publish it, I can see the custom HTML code is added at the bottom of the HTML output right before closing </body> tag. How can I configure this to be inside <head> ... </head> section?
In general, you can't – or rather, shouldn't – add code to <head> through a tag management system. Such code should be added directly to the page's HTML, i.e. with dev support.
What are you trying to insert into the <head>?