I would use a more recent component , the one you showed is very old and will most likely never recieve any support. I use the DnD https://marketplace.mendix.com/link/component/116604 . This was created by a Mendix Frontend Developer, he left the company but its also used in Mendix it's own Stories module.
Create a seperate table with the lanes, load them in the DnD widget . Then, add another DnD inside the first one, mark it as child (its a setting in the widget) and in there, load the tasks.
If you want to see an example how this can work, you can check out https://www.psohub.com , in the task management component that is a kanban board that is build with this