The units and decimal places for RFEM and the add-on modules are managed together. In RF-CONCRETE Surfaces, you can open the dialog box for adjusting the units with the menu item
- Settings → Units and Decimal Places.
The dialog box familiar from RFEM appears. RF-CONCRETE Surfaces is preset in the Program / Module list.
The settings can be saved as a user profile and reused in other models. These functions are described in chapter 11.1.3 of the RFEM manual.