First, select elements on the Floor Plan (or even the entire Floor Plan).
Choose the: Document > Document Extras > Automatic Dimensioning > Exterior Dimensioning..... command and set the options in the dialog box as desired.
Look in AC10 help under dimensions.
Marc Corney, Architect
Red Canoe Architecture, P. A.
Mac OS 10.15.7 (Catalina) //// Mac OS 14.5 (Sonoma)
Processor: 3.6 GHz 8-Core Intel Core i9 //// Apple M2 Max
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ArchiCAD 25 (5010 USA Full) //// ArchiCAD 27 (4030 USA Full)