I usually see this phrase used interchangeably with the prepositions *in* and *on*. I know that their meaning isn’t the same, but I can’t think of situations where we should use one instead of another. Can anyone shed some light on any 
differences between these two:

> 
> 1. In the menu.
> 2. On the menu.
> 
> 
> 

Just to clarify, I’m talking about menus of computer programs.