You can easily reorder your folders in the Media Library by dragging and dropping them.
To reorder folders:
- In the main menu, click the Media Library link
- Select a folder you want to move and hover your mouse over the folder
- Click and hold the left mouse button (or the left side of your trackpad)
- Drag your folder to the desired position using the green guidelines and release the mouse button (or lift your finger from the trackpad)