By default , the setting grid in admin/pos/setting effect for desktop screen. To change other screen , you can use this shortcode and customize as you want to your theme/functions.php or snippets code plugin

if(!function_exists('custom_op_get_login_cashdrawer_data_grid'))
{
    function custom_op_get_login_cashdrawer_data_grid($session_response_data){
        // category grid
        $session_response_data['setting']['pos_cat_grid_column'] = 5;
        $session_response_data['setting']['pos_cat_grid_row'] = 5;
        // mobile screen
        $session_response_data['setting']['pos_cat_grid_column_sm'] = 3;
        $session_response_data['setting']['pos_cat_grid_row_sm'] = 3;
        $session_response_data['setting']['pos_cat_grid_column_xs'] = 3;
        $session_response_data['setting']['pos_cat_grid_row_xs'] = 3;


        // product grid screen
        $session_response_data['setting']['pos_product_grid_column'] = 3;
        $session_response_data['setting']['pos_product_grid_row'] = 3;
         // mobile screen
        $session_response_data['setting']['pos_product_grid_column_sm'] = 3;
        $session_response_data['setting']['pos_product_grid_row_sm'] = 3;
        $session_response_data['setting']['pos_product_grid_column_xs'] = 3;
        $session_response_data['setting']['pos_product_grid_row_xs'] = 3;
        // table grid
        $session_response_data['setting']['pos_desk_grid_row'] = 1;
        $session_response_data['setting']['pos_desk_grid_column'] = 2;
        // mobile screen
        $session_response_data['setting']['pos_desk_grid_row_sm'] = 1;
        $session_response_data['setting']['pos_desk_grid_column_sm'] = 2;
        $session_response_data['setting']['pos_desk_grid_row_xs'] = 1;
        $session_response_data['setting']['pos_desk_grid_column_xs'] = 2;
        

        return $session_response_data;
    }
}
add_filter('op_get_login_cashdrawer_data','custom_op_get_login_cashdrawer_data_grid',11,1);