It is easy to change the order of both documents/resources and sections in the reading list.
1. Documents
a. Click on the three dots on the right and select Cut, Move up, or Move down:
b. Use the arrow and Drag and drop to where you want to move the document/resource:
2. Sections
You can move entire sections by clicking on the three dots on the right of the heading, and then selecting Cut, Move up or Move down: