I am wanting to use two or more themes: Stream King for text-based content; and another for a library of content, that is mostly visual rather than text, and is mostly for the purpose of navigation rather than reading.
I am attempting to use the Multiple Themes plugin. However, I cannot work out how to change the theme from Stream King for specific pages.

I have concluded that most likely it is not possible to do what I explained was my intention in the ticket for starting the conversation. So, I have decided to abandon Stream King for text-based content, and instead to use Indigo, a visual-based theme, for both text and visual. So, it seems to me that the key is to learn how to modify some pages of the Indigo theme so that it is more well suited to text-based content.The About - Example 1, does seem like it can be used for text-based content. Does this seem to you like the right approach? And, as my text-based pages are magazine article size in length, with dozens of paragraphs and images or YouTube videos, can the Sonaar Indigo template be developed in such a way that I can save a design for an extended text-based page to be a global or custom design or whatever is the term.