Origin provides two approaches to pick data points on 2D graph,
To open the X-Function dialog, with the graph window active, enter
With this tool, you can pick data points in two modes: Data Reader and Screen Reader. And, you can customize the output items as your needs. To learn the details, you can refer to these examples.
Since Origin 2018b, you can use a mini tool Pick Data Points to pick data points on a graph.
To pick data points on 2D graph:
Click on the blue question mark, to expand the tips panel to learn more shortcut key info.