For a clear plan of a room, strong line for room boundary, and thin line inside a room, under SW2012, you had to put tangent edges with font (right click on the view).
With SW2014, I can't find this option, all the lines have the same thickness.
Yet between SW2012 and SW2014, I have the same line font options.
Yes in some cases options can be "hidden" but apparently in this case we have a config. Defect of the options and in this case, pressing the arrows does not help us. (In this case I specified).
In this case, at the bottom of the right click, you actually click on the arrows as said by Coyote, you customize the menu and then you select the desired options including "tangent edge".