Hello A J Woods,

Thank you for posting in our community.

I can suggest two approaches for achieving your requirement.

First is to loop all the columns and apply unsortColumn method of igGrid Sorting feature. For example:

 $("#unsortBtn").on("click", function () {

   var colLength = $("#grid").igGrid("option", "columns").length;
   var colKey;
   for (var i = 0; i < colLength; i++) {
    colKey = $("#grid").igGrid("option", "columns")[i].key;
    $("#grid").igGridSorting("unsortColumn", colKey);
}
});

Another option is to turn off the persist feature of the sorting behavior and just rebind the grid. This option enables/disables sorting persistence between states. By default this feature is enabled.

For example:

features: [
{
 name: "Sorting",
 mode: "multi",
 persist: false
}
.
.
]

......
 $("#unsortBtn").on("click", function () {


 $("#grid").igGrid("dataBind");
});

I hope you find my information helpful.

Please let me know if you need any further assistance with this matter.