Hello Adeel Ahmed,

Thank you for posting into our community!

You are right we don't have an option to allow hiding of nodes from the column moving dialog. But you can use the API of the tree (the content of the column moving dialog is actually an igTree).

So to remove a node, you can bind to event of column moving - movingDialogContentsRendered and call removeAt method of the igTree for the nodes you want to remove.

It should be something similar to this:   

  {
    name: "ColumnMoving",
    columnSettings: [
     { columnKey: "idOfTheColumnYouWantToHide", allowMoving: false }
    ],
    movingDialogContentsRendered: function(evt, args){
     var gridId = args.owner.element[0].id;
     args.movingDialogElement
      .find("#" + gridId + "_dialog_tree")
      .igTree("removeAt", "idOfTheColumnYouWantToHide");
    }
   }