For combo boxes with the Dropdown property, you can specify how many lines should be displayed in the dropdown list. With control fields which do not have the Dropdown option, the line's display will be specified by the size of the control field and the font size.
对有“下拉”属性的组合框，可以指定下拉列表中显示的行数。对于没有“下拉”选项的控件字段，可以通过控件字段的大小和字体大小来指定显示的行数。