If you're meaning the difference between v0.18.5 and v0.18.6, there is now a Libby event. v0.18.5 ended with Libby saying goodnight to the MC. With v0.18.6, there's one more small scene (a discussion between 2 yet-unknown characters, which existed before the reworking of the game happened). Then you're in sandbox mode:
- If you're in the MC's room, click the left door to go to the upstairs hall, and then click the right door to enter Libby's room.
- If you are downstairs, click on the stairs and then the right door in the upstairs hall.
Then just click on Libby on her bed (in the morning) and choose the option to talk with her and then the "Getting acquainted" option to start her event.
As Phil also mentioned, if you're in the MC's room, you can also click the laptop, then the girl icon on the left side. From there, click on Libby's picture and then choose the only event listed "Chapter 01: Making Memories".
After her event finishes, that's it for the current content. More is already in the works, though.