After adding the Bing News app to a channel, I realized that I needed to change the search criteria, but could not figure out how to do it. So i had to delete it and start all over. What did I miss? Surely there must be some way to edit this app.
Hope you are well. Did you add the Bing News App like this?
The Bing Icon appears in the bottom of the channel next to the sticker/emoji/meet now icons. You can click the Bing icon, perform a search for content and then select the news to add it to the conversation.
Regarding content, you should be able to search for any content you like, and it bring up a number of articles. In the screenshot above I added Office 365.