Selecting a Structure

Set Selection mode on by clicking one of the three available Selection buttons.

Rectangle Selection
Lasso Selection
Stucture Selection

To select a ...	choose	and..
atom		click on it
atom		click on it
bond		click on the bond that links them
bond		click on the bond that links them
rectangular region		click at one corner of the desired region and drag the mouse to the opposite corner. While the mouse button is pressed down, a guide will be displayed to aid you
non-rectangular region		press the left mouse button to start selecting, and draw the region with your mouse without releasing the mouse button. A blue guide line appears along the selection region. A pink line connects the start and end points.
fragment		double-click on an atom or bond
fragment		double-click on an atom or bond
molecule		click on an atom or bond.
whole stucture		double-click on any part of it
whole stucture		double-click on any part of it

To unselect all click an empty area of the canvas.

The Invert selection (Ctrl+Shift+I) will change the current selection such that everything previously unselected will now be selected and vice versa. If there is no selection, the entire image area will be selected.