This command opens the model settings window. Adjacency separation distance defines the maximum distance that two surfaces can be away from each other, while still being recognized by the software as being adjacent.
This setting is particularly important when modelling a building using thick-wall configuration, as placing two walls further apart than the adjacency separation distance means they will not be considered adjacent, and hence are likely to become external rather than internal walls. Alternative, if set too wide, it can cause two adjoining external walls to be seen as adjacent and hence modelled as an internal wall.
The default value is set at 0.10m, which is an appropriate value for most typical cases.
