Let's say you had 3 libraries loaded with a Project.
You open another file and you want to use these same 3 libraries. Prior to AC13, there was a "Use Active Libraries" button in the Library Manager, which deleted libraries from the list of libraries assigned to the project and in their place it put the libraries last used.
It was very handy.
But with the simplification of the Library Manager in AC13 it disappeared.
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