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For beams or joists with cantilevers, Sizer determines the cantilever deflection limit by taking the specified deflection limit (for example L/360) and assigning the span, L, as equal to twice the length of the cantilever. This is consistent with most model building codes and industry recommendations. For example, for a specified live load deflection limit of L/360 the corresponding deflection limit used for the cantilevered portion of a beam or column would be 2L/360 which is equivalent to L/180, as indicated in Sizer's output, where L is now the length of the cantilever. This approach is taken because the L/xxx format is based on the deflection profile of a simply supported beam.
Sizer also permits you to ignore cantilever deflections in design.