How can I mass change sentiment for multiple posts?

Watch a tutorial video here.

On the overview page of a monitor, in the upper right-hand corner of the screen, there is a Newspaper/Mentions Feed icon for viewing recent posts.

Once selected, it will display a limited number of posts dating most recently. To view the full screen of posts, select the Double Arrow icon.

Once in the full-screen view of the posts, users can adjust the sentiment for posts or delete mentions. Users can also adjust the number of posts displayed on each page. The maximum is 1000 posts.

In the example below a specific tweet was marked as Negative. However, the mention was talking about a Thanos event that should've had a neutral sentiment. Using the search bar and the change sentiment option, I cleared out a lot of negative mentions.