Go to the functions.php file inside of your theme and search for register_sidebar
it could look like this:
function isola_widgets_init() {
register_sidebar( array(
'name' => esc_html__( 'Sidebar', 'isola' ),
'id' => 'sidebar-1',
'description' => '',
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
'before_title' => '<h2 class="widget-title">',
'after_title' => '</h2>',
));
}
add_action( 'widgets_init', 'isola_widgets_init' );
and change it to e.g.:
function isola_widgets_init() {
register_sidebar( array(
'name' => esc_html__( 'Sidebar', 'isola' ),
'id' => 'sidebar-1',
'description' => '',
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
'before_title' => '<h2 class="widget-title">',
'after_title' => '</h2>',
) );
register_sidebar( array(
'name' => esc_html__( 'Sidebar 2', 'isola' ),
'id' => 'sidebar-2',
'description' => '',
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
'before_title' => '<h2 class="widget-title">',
'after_title' => '</h2>',
) );
}
add_action( 'widgets_init', 'isola_widgets_init' );