For my one site, I added a select list(text) > check box field type to my content. When I go to manage display tab(using display suite module), in the format column column for the field, I see drop down field with 4 values ( css class, default, key, list). I selected list. Next to that I also see a geared setting where it allows me to make a comma separated list. When I go to front end, I see the values listed separated by commas. It works fine.
I am trying to do the same thing for my other site. But as for the drop down field, I only see default and key. Also, I don't see the geared setting icon to make it comma separated list. I am not sure what I did wrong on my second site. Both site have the same field type.