On Wed, Jul 1, 2020 at 03:48 PM, Hettie wrote:

Organize Add-ons but no option to search for new ones.

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When you open Add-Ons Manager there is a Get Add-Ons button at the bottom.  You can also download NVDA add-ons from the NVDA Community Add-Ons Page or from private developers, then double click on the file when NVDA is running, and you'll be asked if you want to install the add-on.

As Joseph has already noted there are no NVDA add-ons for Libre Office (or at least there aren't on the community add-ons page, who knows if anyone noodling around with NVDA and Libre Office might have created an add-on, but chances are slim).
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Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363  

Science has become just another voice in the room; it has lost its platform.  Now, you simply declare your own truth.

      ~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019