In ADF width of af:selectOneChoice is adjusted to fit its content and sometime we dont want that to happen specifically when we use af:panelFormLayout with multiple input components like af:inputText af:selectoneChoice.
In this example i am using below code
My UI Looks like Below and you can see dropdown is not align with input textbox.
To align this af:selectOneChoice with af:inputText set contentStyle="width:100%;" of af:selectOneChoice as shown below
With this your dropdown will be aligned as below
