Horizontal Resizing in the Advanced Search tab causes drop-down box to disappear from view

While testing IGBF-196 I noticed that if a user horizontally resizes the window enough while looking at the Advanced Search tab then the drop-down box next to "in" eventually begins to disappear as there is not enough room (view screenshot).

I feel that this could cause a potential problem for the Advanced Search feature in that a user would not see the drop-down box next to "in" if their window is not sized appropriately.

Instead, the drop-down box should just get proportionally shorter in length as the user slides the window horizontally so that they know that this option is available.