 <p>Whenever I've faced this, the places to check are:</p> <ul> <li>Row Groups</li> <li>Column Groups</li> <li>Header text boxes for interactive sorting</li> </ul> <p>9 times out of 10 when I can't find it, it's in the interactive sorting on text boxes. <a href="https://i.stack.imgur.com/g1yUN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/g1yUN.png" alt="Interactive Sorting"></a></p>