Selection/Unselection of points in 2D and 3D Scatter Plot can be done
by selecting the ``Mode'' combo
value as ``Select''/``Unselect''
or click on ``Select Points Mode''/``Unselect
Points Mode'' submenu of ``Mode''
menu.
To select/unselect point(s), drag the left mouse button down and right/left
to draw a rectangular box. The data points that fall within the box
get selected/unselected.
You can keep the shift button pressed while dragging the mouse to
select more points (keeping existing selections as it is).
To clear all the selection on the plot, click on the "Clear
all" icon represented by
or click on "Clear All Selections" submenu from
the "Mode" menu.
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 
.
Note: Selection/Unselection of points and zoom is also possible in
case of Projection plot.