On the block diagram, the label of a subVI is always visible. You cannot edit this label. However, as you create VI descriptions, you can edit function labels to reflect the use of the function on the block diagram. For example, you can use the label of an Add function to document what quantities are added or why they are added at that point on the block diagram.
Complete the following steps to edit a free or owned label.
If necessary, right-click the object and select Visible Items»Label to hide or show the label. The labels for structures and functions are hidden by default.
Use the Labeling tool to click the label and highlight the text you want to edit. Double-click the label to highlight a word or triple-click the label to highlight the entire label. If automatic tool selection is enabled, double-click the label to switch to the Labeling tool and highlight the text you want to edit.
Edit the label text. You can press the <Enter> key to add a new line.
Click anywhere outside the label to complete the edit operation. You also can click the Enter button on the toolbar or press the <Shift-Enter> keys on the keyboard. When the text of the owned label changes, LabVIEW must recompile the VI and possibly recompile the VI callers.
Note You can complete edit operations with the <Enter> key if you place a checkmark in the End text entry with Return key checkbox in the Front Panel page of the Options dialog box.