@Barb_Rice Sure you can! Select all cells, right-click on any of the column headers (A, B, C ... whatever) and press Unhide. Or if you have hidden, let's say columns B and C and only want to unhide those, select entire columns A and D. Then right-click and Unhide.
Is this doesn't work for you, kindly include a screenshot of what you see and describe step-by-step what you have tried.
