If you now sort it by SKU (Column B) and want to undo that sort, the easiest way is to use Undo button in the Quick Access Toolbar (or use the keyboard shortcut CTRL + Z).

How do I Unsort a sort in Excel?

In MS Excel 2010 version there is an option to unsort multiple/many columns in excel in one go: HOME->EDITING->SORT &FILTER drop down menu->CLEAR.

How do I Unsort in Excel 2020?

Below are the steps to unsort the data in Excel:
Right-click on the left-most column.Click on the Insert column option. [Optional] Add a header in cell A1.Add 1 in cell A2 and 2 in cell A3.Select both the cells (A2 and A3), place the cursor over the bottom-right part of the selection. Click and drag.