I seem to remember that it was possible to access the Library of Congress catalog from the web search drop-down menu. The release noted for version 4.0 also announced the feature.
Yet I cannot the LOC in the web search menu any longer, nor is it in any menu AFAIK. The online manual is also silent about it when discussing web searches.
Did LOC searching/downloading disappear in v. 5.0?
I am on:
Linux 5.7.2-arch1-1 amd64