While Fleets is still not a major element of the platform, it has been slowly attracting interest, and seeing more usage. But one of the more annoying elements of Fleets is that whenever someone reacts or replies to your story (Fleet), you get a DM informing you of that response.
That’s similar to Instagram’s Stories reactions, but on Twitter, which is more open to the public, it feels a bit more intrusive. So now, you can turn the DM notifications off if you choose.