Exporting a list of banned hashes from an EDR server is not a visible feature or button found in the EDR console at this time.
To access a list of banned hashes, log in to the console and replace the URL with: https://<server>/api/v1/banning/blacklist
The list of banned hashes can also be accessed via the API, more information is located on the Developer Relations website, links found under 'Additional notes'