<para>
<keycap>Shift</keycap> (and hold) + left mouse button: Draws a bounding box area on which to zoom in. The zoom action is performed when the left mouse button is released.
</para>
+<para>
+<keycap>Shift</keycap> + left click button: Jump Zoom In by up to factor of 3 standard zooms.
+</para>
+<para>
+<keycap>Shift</keycap> + right click button: Jump Zoom Out by up to factor of 3 standard zooms.
+</para>
</section>
<section><title>Ruler</title>