k
to <em>remove annotations</em>. (Adding and removing annotations requires
version 0.20.1 or higher of the Poppler library.) Hovering over an
annotation displays its contents as a tool tip.</p>

<p>To <em>zoom to a selection</em>, hold <b>SHIFT</b> and <b>CTRL</b>, click
and hold the left mouse button to drag a frame around region to zoom into.</p>

<p>The <em>visibility of the tool and menu bars</em> can be toggled using
configurable keyboard shortcuts whose default values are "Shift+Alt+T" and
"Shift+Alt