On every page with stories, you can filter those stories according to various attributes. They're relatively straightforward, and you can find more detailed descriptions of each attribute here.
The filter will look something like this:
The three dots are used to group less important filters together. As we grow the platform, there will be more of these available. There is one other important thing to point out on the Filter Bar. Under publications and sources, you can choose Advanced, which will allow you to choose whether you want to see tweets that only include links. If there is text in the tweet, it could be opinion; if there is no text, the tweet only contains a link to another source of information.