Use the Positioning tool to resize labels. Labels normally autosize, meaning the box automatically resizes to contain the text you enter. Label text remains on one line unless you enter a carriage return or resize the label box.
Right-click the label and select Size to Text from the shortcut menu to toggle autosizing on or off.
When you resize a label, LabVIEW automatically turns autosizing off.
You can resize a string constant the same way you resize a label.