Modifying Families - Autodesk Revit Architecture 2015 Essentials - page 165

Figure 6.34 Selecting and editing the break line
4. In the View Control Bar, change the scale of the view to 1 1/2 ″ = 1 ′ -0 ″
(1:10) so the dimensions are more legible. Use Zoom To Fit to see the
extents of the constraints (Figure 6.35).
Figure 6.35 The masking region with all constraints displayed