Change or delete a header or footer on a single page
To delete or change headers and footers on individual pages within a document, start by inserting a section break. Important: Section breaks are different from page breaks. If you already have a page break before the page where you want to change the header or footer, remove a page break and replace it with a section break as shown below.
Add or remove data labels in a chart - Microsoft Support
To quickly identify a data series in a chart, you can add data labels to the data points of the chart. By default, the data labels are linked to values on the worksheet, and they update automatically when changes are made to these values.
View and compare documents side by side - Microsoft Support
For information about comparing document differences, see Compare document differences using the legal blackline option. Open, view, and compare two documents at the same time.