TSconfig

mod.SHARED.colPos_list is no longer working since TYPO3 6.0. Mark it as removed.

Instead, backend layouts are the replacement.

So tell people to replace their configuration of mod.SHARED.colPos_list with a BE layout. And also add to the section "What's new" that mod.SHARED.colPos_list should be replaced by a backend layout - it is a breaking change. :-(

Example for a Backend Layout:

Create a record of type "Backend Layout" maybe best in the root page of your website. Add the following configuration. You can use the wizard next to the configuration field as a help.

backend_layout {
    colCount = 2
    rowCount = 1
    rows {
        1 {
            columns {
                1 {
                    name = Content
                    colPos = 0
                }
                2 {
                    name = Left
                    colPos = 1
                }
            }
        }
    }
}

Then go to the root page of your website, page properties > Appearance and select the new Backend Layout for this page and for the subpages. This way the new Backend Layout will be preselected for all subpages (also for new ones).

This will display the content of the columns with colPos=0 and colPos=1. They will be labeled "Content" and "Left".