Create a new folder in Calibre Portable (where calibre-portable.exe is), viz:
In calibre, select Create/switch library and set up a new library in the empty folder, viz:
Tick the "Copy structure..." box if needed
Quote:
Copy structure from the current library
Copy the custom columns, saved searches, column widths, plugboards,
user categories, and other information from the old to the new library
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BR