Note that this does not affect VIs that you have already created. These options under the Environment category are shown here:
Editing the color in the LabVIEW Options adds the diagram. background token to the LabVIEW INI file (located in the same folder as LabVIEW.exe). The value for the token is 00 followed by the hex triplet color code representing the chosen color. For a white background, the token appears as follows:
diagram. background=00FFFFFFChanging the Background Color for Block Diagrams of Existing VIs:There are two ways to change the block diagram of Existing VIs. You can accomplish this manually or programmatically.To accomplish this manually for a single VI, open the Tools Palette and choose the Coloring tool. Then, right-click on the block diagram background and you will be able to choose the background color. For more information about this solution, see Coloring Objects and Backgrounds. The following shows what the Coloring tool looks like:
To accomplish this programmatically, there is a block diagram property that can be edited to change the background color of an existing VI. You can potentially use this approach to change the background color for multiple block diagrams quickly.
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