Answer:
In RFEM 5 and RSTAB 8, you can adjust the units of results in the "Units and Decimal Places" dialog box. You can open this dialog box using the drop-down menu "Edit" → "Units and Decimal Places". Then, switch to the "Results" tab.
This dialog box also provides the option to specify the settings for the model, loading, and dimensions in the respective tabs. Furthermore, it is possible to make various adjustments for diverse add-on modules. To do this, select the relevant entry in the "Program/Module" list on the left.