Data labels are the values in the chart, which make the chart easy to understand. Please follow the steps below to add data labels to a Chart:
Step 1: Click anywhere on the chart and the "Design" Tab will appear in the Ribbon ("Chart Design" tab in Excel 2019);
Step 2: In the "Design" tab, click "Add Chart Element";
Step 3: Click "Data Labels" from the drop down list, then click one of the positions "Center", "Inside End", "Inside Base", "Outside End", or "Data Callout";
Step 4: For example, the below is the "Center" position.
To delete the data labels, click on one data label and press the delete key from the keyboard. Alternatively, you can repeat the steps above and select "None".