直接上代码吧:

// 搜索相关
$grid->filter(function (Grid\Filter $filter) {
    $filter->expand();
    $filter->column(1 / 2, function ($filter) {
        // 如果需要自定义搜索名称需要在__cotruct里面定义,详情可查看vendor\encore\laravel-admin\src\Grid\Filter\Where.php
        $filter->where(function ($query) {
            $query->where('xxx', $this->input);
        }, '激活码', 'xxx');
        $filter->equal('xxx');
    });

    $filter->column(1 / 2, function ($filter) {
        $filter->between('created_at')->date();
        $filter->equal('xx');
    });
});

效果如下: