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I'm not sure that rqt_plot has a button for that. You may find better options if you switch the plotting frontend.

In the past, I've used the -p option to rostopic echo to dump data in a CSV format. This works well for fixed-size messages, and not as well for messages that contain arrays and other large data structures. You could probably do something where you use rosbag play in one terminal and rostopic echo -p in another.