The active graph is selected by a left click into the graph. The active graph is highlighted and indicated by the Oroboros logo.
Add: A new graph is added at the bottom of the screen. Select plots for display in the new graph, Ctrl+F6
Delete: By clicking Delete bottom graph in the Graph-menu in DatLab, the bottom graph is deleted, which reappears with the same layout by Add.
MitoPedia O2k and high-resolution respirometry: DatLab