在设计窗口中按如下所示增加下拉列表的大小:

Increase the size of the dropdown list like this, in the design window:

单击组合框右侧的箭头(在第一个图片上以黄色突出显示).然后单击并拖动底部的中间大小调整标记以增加高度(在第二张图片中突出显示).

Click on the arrow on the right side of the combobox (highlighted in yellow on first pic). Then click and drag the bottom mid resize marker to increase the height (highlighted in the second pic).

这将增加下拉列表的大小.

This will increase the size of the dropdown list.

否则，当我们尝试单击调整大小标记以增加高度时，它将被禁用.因此，请确保先单击组合框右侧的箭头.

Otherwise when we try to click on the resize markers to increase the height, it would be disabled. So make sure you click on the arrow on the right side of the combobox first.