As suggested by @asianindexing in #2, instead of showing an empty sidebar, the outline could not be shown at all if there aren't heading tags in the document.
Example of the current behavior: https://tocs.asianindexing.com/chapter.php?id=1681210093508_56113557&title=Preface
As suggested by @asianindexing in #2, instead of showing an empty sidebar, the outline could not be shown at all if there aren't heading tags in the document.
Example of the current behavior: https://tocs.asianindexing.com/chapter.php?id=1681210093508_56113557&title=Preface