I found a promising looking answer to this question in the following post:
http://wordpress.org/support/topic/customizing-admin-area-using-functionsphp-2-questions
It recommends using this code in the functions.php file:
function so_screen_layout_columns( $columns ) {
$columns['dashboard'] = 1;
return $columns;
}
add_filter( 'screen_layout_columns', 'so_screen_layout_columns' );
function so_screen_layout_dashboard() {
return 1;
}
add_filter( 'get_user_option_screen_layout_dashboard', 'so_screen_layout_dashboard' );
Hope that helps!
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