Zooming points in Scatter Plots can be done by selecting the "Mode" combo value as "Zoom" or click on "Zoom Mode" submenu from the "Mode" menu.
To zoom in to point(s) of plot, drag the left mouse button down and to the left/right to
draw a box around an area to be zoomed in. To zoom out, drag the left mouse button up
and to the left/right. To get the original graph, click on the "Show Full Range"
icon represented by 
fill.
Note: Selection/Unselection of points and zoom is also possible in case of Projection plot.