There is a rank order for visibility settings.. & it is quite complex & dependant on what type of view you are using it for. Working, 3D or plotting view.
Generally if you want to set a view to override a object style, I would tend to use a filter to override. Could you clarify what type of element you are trying to make as thin lines?
If its your ductwork or pipework than put in a filter for that view to override object style. Select all duct/pipe elements in the filter rule & change to thin linetype.