Use the button from the
toolbar or the View /Swap between
diff/merge modes menu item.
You can
switch from 2-way mode toward a 3-way mode to add a file or
ancestor folder or completely ignore an existing ancestor, to
do this use the button fro
the toolbar or the Document / Three-Way Comparison
menu item.
button from the
toolbar or the View /
Swap between
diff/merge modes menu item.
You can
switch from 2-way mode toward a 3-way mode to add a file or
ancestor folder or completely ignore an existing ancestor, to
do this use the 
button fro
the toolbar or the Document / Three-Way Comparison
menu item.