Revit LT controls the appearance of structural concrete components that are in a hidden state in a view. The appearance of invisible lines of walls, floors, framing, columns, and foundation elements are controlled by the following view parameters:
Structural floor and beams framed into concrete walls
Note that the on-screen display of hidden lines may not precisely match vector output. Some edges of wall ends will not show as hidden and all edges of a slab edge will show as hidden in a plan view if obstructed by the slab.