Select &quot; Yes &quot; to enable the dropdown option for list or combo box controls. A dropdown control field has an arrow button which you can click to open a list of the existing form entries.
选择“是”将对列表框或组合框控件启用下拉选项。下拉控件字段包含一个箭头按钮，通过单击该按钮可以打开现有窗体条目的列表。