change the css for extend the menu spun

Look for

}
#secondary {
clear: both;
display: none;
padding: 50px 0;

then comment the line where display: none; shows and you are good to go!

Ideally you’d want to make that change without modifying the theme’s files. Spun often receives updates. If a theme updates while it has been modified, its modifications will be erased.

If you don’t have a “Custom CSS”, “Custom CSS Manager” or “Edit CSS” section of the dashboard, or a Child Theme, install this Custom CSS Manager plugin and use its section of the dashboard to hold your CSS modifications.

That means creating new styles that override old styles.

Taking on @sharongolod’s advice, try adding this new style:

#secondary {
 display: block;
}