Why I can't delete non-project stype's column ?

[listy]

Hi,

    If you wan't to remove a column from existing project, you have to delete in all projects individually. If you don't want this column in future projects remove it from template project and update the template.

but I can't manage this non-project stype from other project. only can manage it in "admin" project.

You can check table with XML definitions and manually cut-off all xmls that you don't need.