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Are you using 3 separate output tools? If so try using the 'Block Until Done' tool to control the order in which the output tools write. Find a logical point in your workflow where it branches into these three outputs and connect each branch to the corresponding anchor on the tool
If you're overwriting the sheets in an existing workbook the sheet ordering would be determined by the workbook and Alteryx would respect that (I just tested this to be sure). Open your excel file, order the sheets how you want, then run your workflow. Is the tab order changing?