Modifying spectral bands

With the Vegetation Indices attribute, you can change the spectral bands that you want to use.

To modify the spectral bands of Vegetation Indices

In the Modify Spectral Bands window, under Spectral bands, in the Red, Green, Blue, or NIR list, as applicable, select the band you want.
That is, the available bands are those of the active file indicated in the File box.