When you import designs created outside EngView, gaps may occur between the objects or various constructional discrepancies. You need to correct such discrepancies by fixing them.
To fix a design means to transform sections of it or to bring a new shape to it by closing gaps, correcting angles, joining objects, and so on. You can apply fixing transformations to a whole design or to parts of it. In a design, you can further fine-tune the relations between the objects when you apply transformations.