Can the default unit of the map scale bar or the Directions widget be changed in ArcGIS Experience Builder?

Answer

No, it is not possible to directly change the default unit of the map scale bar of the Map widget or the Directions widget in ArcGIS Experience Builder, however users can change the Units setting in ArcGIS Online.

Note:
The Units setting change in ArcGIS Online applies to the map scale bar, measure tool, directions, and analysis across ArcGIS Online apps.

1. Log in to ArcGIS Online.
2. Click the profile name on the top right and click My settings.
3. On the General tab, navigate to Units.
4. Select Metric.

The image below shows the unit of the 'Scale bar' tool in the Map widget in ArcGIS Experience Builder is changed to metric units after refreshing the experience.