So I was modifying the UI for the Quest to play nice with my game, when I found out that the scroll is not working, so I taught that maybe I'm doing something wrong, so I used the default one just to test, and had the same problem.
Here is a link to my problem
Also I was wondering if it easy to have this UI for the Quests, cuz right now I don't understand quite the way it works, so if it's hard I'll find another solution.
It looks like your ScrollRect and Scrollbar got disconnected.
What version of Unity are you using? I'll post an example that's similar to your screenshot. Is the big white rectangle supposed to be an image? Or more text?
It uses a subclass of UnityUIQuestLogWindow to add functionality for two panels (left/right). The code is commented, so you can customize it if you want to change the way it works.
So I've been working with the example you gave me and it was everything ok until I moved it into my scene in my canvas, and my problem persisted, so I've been trying to understand what was the problem, and went back to the example you gave me, and checked the pixel perfect option on the canvas, and I had the same problem.