<p>The 2 leftmost zoom buttons (<kbdclass="menu">−</kbd> and <kbdclass="menu">+</kbd>) use this zoom focus to zoom out and in respectively.<p>
<p>The <kbdclass="menu">Zoom to session</kbd> button is a handy shortcut to zoom out or in until all the session (as defined by it's <ahref="/working-with-markers/">start/end markers</a>) fits horizontally.</p>
<li><dfn>Selected tracks</dfn> that focus on the selected tracks. If the selected tracks are not contiguous, the unselected tracks inbetween will be hidden, see the <ahref="/ardours-interface/editor-lists/tracks-and-busses-list/">Track and Bus list</a>.</li>
<li><dfn>All</dfn> that fits all the tracks of the sessions vertically (provided there's enough screen estate).</li>
<p>The rightmost buttons <kbdclass="menu">Shrink tracks</kbd> and <kbdclass="menu">Expand tracks</kbd> reduce or expand the vertical size of the selected tracks. If no track is selected, all the tracks will be shrunk or expanded each time the button is pushed.