Hi R,

Yes, it is possible to select all data points or data labels in a graph at once in Excel. Here's how you can do it:

1. Click on the chart to select it.
2. Click on the "Chart Elements" button (the plus sign icon) that appears next to the chart.
3. Check the box next to "Data Labels" or "Data Points" (depending on what you want to select).
4. All the data labels or data points in the chart will now be selected.
5. You can now format them all at once by using the formatting options in the "Format" tab that appears in the ribbon.