The long metal bar the width of the desk should have little finger tabs to keep it from pulling loose. You should be able to lift it up and then pull it straight out so the tabs clear the slots? If you had the shelf there and had weight on it, it might take a couple gentle wacks on the bottom of the bar to loosen it. Depending on how tight it is, you may have to do both sides at the same time. You may also have to take that top shelf off temporarily to be able to move the side supports enough to free the middle support you are trying to move or remove.
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