You can adjust the units and the decimal length in SCIA Engineer.
The unit dialog can be found in File > Project settings > Unit set
You can also access the unit dialog via the status bar on the top right of the screen.
Note that you can change the user default settings. This way you do not need to change the default settings each time you create a new project.
Use the button 'Store user-default settings' to save your settings and use the button 'load user default setting' to load these settings in a new project.