There is no ‘scale’ setting in SU per se. Everything is drawn in real world dimensions, full size.
The notion of scale only comes into play when printing orthogonal views of a model on paper.
It would help us help you if you’ll describe in more detail what you’re trying to accomplish.
As @DaveR suggested, sharing the model for us to work with first hand fosters communication, saving time.
In the interim, have a look at this topic and the video tutorial below:
