May have found already information online how to remove the Commas for dimensions in Windows computers:
But what about for Mac?
In general, all these settings aren’t not going to be displayed according to ArchiCAD settings, but rather to your computer time and number settings.
For Mac go to:
>System Preferences>Date and Time>Open language and region settings>Advanced and click None.
*The system preferences are changed so it will change in all your programs not just ArchiCAD, make sure to restart ArchiCAD so the changed can be made for the registry, also, the views will have to be rebuild or refreshed so you can publish/save with the new dimensions with no commas.