Form items can be transformed from one type to another.
Convert a widget
Right-click on the form item to select the menu option Convert Widget. Select a
new widget from the list.
Convert a container
Right-click on the container object in the Form Design window to select the menu option
Convert Container. Select a new container type and options in the Convert
Container dialog.
Convert to matrix
Right-click on a field to convert it to a matrix container.