How to prevent Unity's ScrollRect from moving as the size of the content changes?

An easy fix Would be to add a vertical or horizontal layout group on ViewPort->the parent of the content Object. And set Position accordingly.

I seem to have had the exact same problem as you. I asked GPT-4o this question and it absolutely killed it, with the solution working out of the box. This surprised me because it isn't a typical algorithms question that LLMs excel at but a rather niche problem specific to Unity for which little online information exists.

GPT-4o response:

using UnityEngine; using UnityEngine.UI; public class ScrollRectFix : MonoBehaviour { public ScrollRect scrollRect; public VerticalLayoutGroup layoutGroup; public ContentSizeFitter contentSizeFitter; // Method to remove a child and fix the scroll position public void RemoveElementAndFixScroll(GameObject element) { StartCoroutine(RemoveElementAndFixScrollCoroutine(element)); } private IEnumerator RemoveElementAndFixScrollCoroutine(GameObject element) { // Disable layout components layoutGroup.enabled = false; contentSizeFitter.enabled = false; // Remove the element Destroy(element); // Wait until the end of the frame yield return new WaitForEndOfFrame(); // Re-enable layout components layoutGroup.enabled = true; contentSizeFitter.enabled = true; // Force layout rebuild LayoutRebuilder.ForceRebuildLayoutImmediate(layoutGroup.GetComponent<RectTransform>()); // Wait until the end of the frame to ensure layout is updated yield return new WaitForEndOfFrame(); // Reset the scroll position to the top scrollRect.verticalNormalizedPosition = 1f; // Optionally, add another yield here if you still experience issues // yield return new WaitForEndOfFrame(); // Additional adjustments if necessary } } 

It worked out of the box and the only change I needed to make was to change 1f to 0f (I needed to scroll to the bottom rather than the top).

Source: https://chatgpt.com/share/6e067eda-c775-48e3-89c9-a3f651be5e6e