Functions.php

/** Pagination on home page  */
add_action( 'pre_get_posts', 'child_change_home_query' );
/** Changes the query on the home page*/
function child_change_home_query( $query ) {

if( $query->is_main_query() && $query->is_home() ) {
$query->set( 'posts_per_page', '10' );//change to the posts setting for your widget
}

}