You don't have to add a header to every Excel worksheet individually when you can group them first. Adding a header (or footer) to an Excel sheet is a simple task using Excel’s Page Layout view.

You can also switch to the Page Layout view by clicking on the respective button on the bottom right side in Excel (refer to the above screenshot).

If the Freeze pane is frozen or not working in Excel, follow the suggestions mentioned to resolve the issue successfully: Change the Page Layout view. Unprotect the worksheet.