Regarding the issue with the sub-categories, thanks, @ Sunlite, I figured it out.
Regarding the issue with the migrated Calibre library location, @theducks, it's still not clear to me what is happening.
1) The library was migrated to a hard drive is used for other general purposes. Additionally, the library now exists in a folder that shares a root folder with other neighboring folders. Is this a problem? What is involved with Library Maintenance? Is there a default command within Calibre for this?
2) The library is not on a network shared or NAS/CLOUD setting. I don't tamper with the library. How can I better manage delays or file timing?
3) Do either of the plugins you suggested help search for missing ebooks entirely?
Thank you for the help!
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