You would use File Explorer or Finder to open the folder that contains your catalog and rename it using your operating system. After you have completed the rename process, just double-click on it with its new name and it should open up in Lightroom.
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Thanks, I know if I change photo files outside of LR, LR gets lost so I didn't think that would work but, it did.
Do you also need to alter the names of the related folders like:
If you rename them at the same time as the catalog, the Previews and Smart Previews will already be built and used.
If you do not rename then Lr creates new Previews folders (with the new catalog name ) that it has to re-build.
Have a look at this link by Laura Shoe-