Want to align DropdownButton next to a TextField in Flutter? I am not sure whether this solution helps you or not, but I think its better than using row.
prefix: DropdownButton(underline: Container(), ...)
If you like this question & answer and want to contribute, then write your question & answer and email to freewebmentor[@]gmail.com. Your question and answer will appear on FreeWebMentor.com and help other developers.