Yes, you can half swipe on Instagram stories or DM's. It is a feature that Instagram doesn't officially support but it can be achieved by some steps. Here's how to side swipe on Instagram to see someone's story without being seen.
1. Open the Instagram app on your phone.
2. Click on the previous story to see the next desired story with half swipe.
3. Once the previous story starts playing, Press and hold it and half swipe it without lifting the fingers off the screen to see the desired story.