Lists are sorted alphabetically by default. To change the order of lists:

1. Hover over the Lists header.
2. Click on the dropdown arrow to the right of the header name to display settings.
3. Click Sort by drag and drop.

When lists are sorted by drag and drop, hovering over a list will now display a drag handle to the left of the name.

Now you can reorder your lists by drag and drop:

1. Click and hold to the left of the name to pick up the list.
2. Drag the list to the desired position.
3. Release to drop the list into position.