No limits, I have portables with tens of thousands of books.
When you say: 'So I copied it into the default library...' What exactly did you copy and with what did you copy it.
The contents of a library are defined by what is in the library database (metadata.db file) not by what sub-folders exist within the library folder. So if you copy author and book folders from one library to another with a file manager the library database will not be updated hence the number of books displayed will not change.
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