By default, the Select tool is
active when Reader opens, because it
is the most versatile tool.
Specialized tools, such as those
for zooming in or adding review comments, are available in toolbars
and in the Tools menus.
Select a tool in a toolbar.
Choose Tools > [toolbar name]
You can use these tools temporarily,
without deselecting the current tool.
When you release the keys, Reader reverts
to the previously active tool.