The section of the array toolbox in MakeCode Arcade that contains blocks used to make changes to the contents of an array is the "Main answer" section. Here's an explanation for a long answer:
1. Open MakeCode Arcade and navigate to the array toolbox.
2. Look for the section labeled "Main answer."
3. Inside this section, you will find blocks specifically designed to modify the contents of an array.
4. These blocks may include options to add or remove elements, replace values, or rearrange the order of elements within the array.
5. Utilize the blocks in the "Main answer" section to make the desired changes to the contents of your array.