Left-click and hold ⋮⋮ to the left of a task.
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Drag the task up or down the list.
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Release the mouse button to place the task.

Left-click & hold the first task in a group.
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Drag the cursor up or down to select more tasks.
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Left-click and hold ⋮⋮ to the left a selected task.
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Drag the task up or down the list.
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Release the mouse button to place the task.

Left-click and hold ⋮⋮ the parent task or heading.
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Drag the entire block up or down the list.
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Release the mouse button to place the block.
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Left-click & hold the first task in a column.
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Drag the cursor left or right to reorder tasks.
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Release the mouse button to drop the column.