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A dual axis allows you to compare multiple measures with different scales by layering independent axes on top of each other. When creating a dual axis, it is recommended that you align the axes with each other using the “Synchronize Axis” option to ensure you make a scaled and correct comparison. However, sometimes this option may not be available. This is because the data type of one of the axes is different from the other. To resolve this issue, you must change the data type of one of the axes.
Further details : Synchronizing Axes | Tableau Software
if the scale of two measures are same then do we still need to apply synchronize axis