Apparently, synchronized zooming does not work on tabbed chromatogram graphs that are not showing. I am sure I did this to reduce the cost of zooming when not all graphs are showing, because there can be really a lot of these graphs. Perhaps there is some way we can push the zoom-and-pan stack onto a graph pane when it is activated to both avoid zoom-panning hidden graphs, but also have them correctly zoomed when shown.

Still relatively low priority, and I remember your spending so time on this and finding it not easy to fix. Probably not worth a more concerted effort just now.

Hasn't gotten done. People have lived with the current status a long time.