Your screenshot shows that Viewport has two children, Content and Description. You stated that Content has a ContentSizeFitter component. If your text is on the Description object, the ContentSizeFitter is not going to adjust its size for the text because Description is not a child of Content.

You may need to move Description to be a child of Content, or add a ContentSizeFitter to Description.

Your screenshot shows that Viewport has two children, Content and Description. You stated that Content has a ContentSizeFitter component. If your text is on the Description object, the ContentSizeFitter is not going to adjust its size for the text because Description is not a child of Content.

You may need to move Description to be a child of Content, and add a VerticalLayoutGroup component to Content.