BTW, the "1" means go back to the "unzoomed" plot, i.e., the first plot (again, a misleading plot). I find it slightly confusing and will take up the issue with gnuplot discussion list. After that, the "+" and "-" buttons should do something. To zoom, use the right mouse button to click on the plot window and release to select a box which will be the new zoom. Since you probably have not done zoom, selecting those buttons is already at the front (and end) of the list of zooms.
The "+" and "-" would suggest zoom-in and zoom-out but that isn't what they do.
That would suggest these buttons are a way of navigating some kind of zoom history. Placing the mouse over the button brings up the tool tip which says "Previous zoom" and "Next zoom". I just ran gnuplot to test those buttons in the Qt terminal. Two of the GUI buttons do not do anything,
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