Both CAN NOT be in the same folder (unless you have them in a backup Archive and those are not technically a Calibre Library when in that state).
If you are restoring from a backup,
Just put them into 2 separate folders (side by side, but not merged)
Then use the Use Existing option to point at the first, then the other
The default (With 1 book) will still be on the list, You can remove that while using either of the others (just select delete: That only deletes the Switch list Entry)
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