You cannot activate the controls of the form or edit contents of database records in Design Mode. However, you can change the position and size of the controls, edit other properties, and add or delete controls in Design Mode.
在设计模式中，您不能激活窗体中的控件，也不能编辑数据库记录的内容，但可以修改控件的位置和大小、编辑其他属性、加入或删除控件。