Delete chapter: click on the 3 dots → Archive/delete page
All the pages in the chapter will be deleted.
Remember that if the chapter and its pages have been published in a previous revision, they will be archived when the revision is published. Otherwise, they will be deleted when saved.
Add import new chapter:
Click on "Add Chapter" (which will be placed at the bottom) → Drag and drop the new chapter where you want it to be → Save.
Click on the new chapter and go to Settings → Import.
Select "Import file as a new chapter"
Note: Please remember to use Chrome when taking this action. If you want to know more about performance, please check our article on Browser Compatibility.