Org.sirius.viewpoints.description, pkg ... sections appeared in Project Explorer

Hi All,

I referenced and then unreferenced some add-ons to be able to make functions automatic transition (as the active add-ons did not let the transitions happen), then after I unreferenced and refrehed the project, these appeared in the project explorer. I want to delete them, I don’t know if I have to keep them, and what the utility of them is.