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By default, menus in IMP and in Horde in general, are collapsed. They have a little (+) plus sign next to them which you click to expand the menu.<br />
This explains how to make menus expanded by default.

Find \texttt{horde/imp/lib/Block/tree\_folders.php} and look for the \texttt{\$tree->addNode} entry that affects the menu that you want to change.

Under a Debian Sarge installation the file is located under \texttt{/usr/share/horde3/imp/lib/Block/tree\_folders.php}.

In line 159 - 161: the expand option defaults to false change it to true (see example below):

<pre><code class="language-php">
\$tree->addNode(\$parent, \$registry->get('menu\_parent', \$parent),
               sprintf('<b>\%s</b> (\%s)', \$registry->get('name', \$parent), \$unseen),
               \$indent - 1, true, \$node\_params);
</code></pre>
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