An electrical switch device features a switch module housing that fits at least partially within an in-wall electrical box. The housing contains electrically controlled switches and has line and neutral contacts carried for each of the electrically controlled switches to enable connection of a different respective load circuit across each electrically controlled switch. A control panel is mountable over an open front of the in-wall electrical box and the housing therein, and has a user-interface for operation of the switch module to control the electrically controlled switches and connected loads. The control panel is sized to fully cover the open front of a multi-gang electrical box, whereby the same switch module and control panel are usable with either a single-gang or multi-gang electrical box without leaving any portion of the open front of the single-gang or multi-gang electrical box uncovered by said control panel.