Essential Guide to Automatic dimensions are in Meters and not in Millimeters in AutoCAD®Architecture 2021

When your Automatic Dimensions (tsl's) are in Meter (m) and not in Millimeters (mm) in your layouts then you need to change the AEC Dimension Settings in the AutoCAD® Options dialog box to mm .

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Don't forget to change this in your Template drawing.

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Select the AEC Dimension tab in the AutoCAD® Options command.
The Options dialog box is displayed.