on click of next button, fullscreen exit

[Nabeelshar]

When user in Fullscreen in chapter page and they click next chapter they exit Fullscreen. Possible solutions. Ajax next chapter.

[Tetrakern]

This is just how to Fullscreen API works; it's exited when you navigate. This is a bit inconvenient but not terrible. Using AJAX to load the next chapter is certainly technically possible, but not feasible with how the theme works. A chapter page is not just the content and comments; the whole DOM is referencing the chapter. You would have to replace the whole document, which would probably close the fullscreen again and turn the theme essentially into a single page application.

This would require a complete rewrite of how the theme operates, you might as well make a React app.