Origin 2020b adds a mini toolbar button on the graph layer level to add statistics lines such as mean, median, max, min, mean+SD, and mean-SD based, on all plots in the layer.
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Add Reference Lines and Linear Fit Lines to a Plot
Align legend, multi-line text, layer & text
Copy Data from Worksheet or Matrix to Graph
Mini Toolbar Additions for Graph Editing in Origin 2020b
Copy Paste Plot