Kavita now supports mixed media libraries. For example your Light Novels (epub) and your Manga (cbz,cbr) can coexist in the same library. A library now is more just a grouping of media. Icons will show next to the series or book name to help you understand that, for example, one is a book and one is a PDF file.
To create a new Library an Admin can select the Server Settings option from the Drop Down menu. Then select the Libraries Tab. Click the Add Library button. And give the Library a name. Once named click on the Type Drop Down menu to select the type of media in this Library. Next click the Plus sign icon to begin the Folder selection process. Each folder has a Share button which can be used to select all content in all sub-folders. However, Clicking on the folder names allows you to drill down further to Share the exact folder you want.
Note: The folder selection process is the same on any install but will depend heavily on your configuration. If a Docker install is used the bind mount for the shared Content will be in this list under that name. e.g.
-v /your/manga/directory:/manga In this example /manga will be visible in the Folder selection process and will lead to your shared content.