LabView 7 has a re-size button on the toolbar. Select all the objects you want to resize (either by drawing a rectangle around all the objects, or by shift-clicking on them one at a time), then click on the resize button and select one of the options.
In LabView 6, you'll need to initially get the objects to the same size manually or by copying them. But then, in LabView 6 or 7, if you group a collection of objects, they resize together. Get them to the same size initially, then group them. They'll resize together after that. The LabView User Manual, in a section titled Grouping and Locking Objects states "Grouped objects maintain their relative arrangement and size when you use the Positioning tool to move and resize them."
To group a collection of objects,
select all the objects, then click on the Reorder button on the toolbar and select Group.
