The shape of the Activities button represents your workspaces, the grouping of windows on your desktop. For example, below is the shape of the Activities button if you have 3 workspaces and the second workspace is the one that it displayed right now.
<p>By default, any setting that you change in Tails is lost when you shut down. Only the settings that you saved in the [[Persistent Storage|persistent_storage]] are restored when you restart Tails.</p>
<p>To learn about the many keyboard shortcuts in GNOME, open the <i>Settings</i>. At the bottom of the <b>Keyboard</b> section, choose <b>View and Customize Shortcuts</b>.</p>