OpenLab Ezchrom

Im working with the OpenLab EZchrom software, in the channels tab i used to have a channel that register the chromatogram at 280 nm and somehow it changed to 0 nm, this makes the chromatogram to have no mAU intensity and no peaks. I manage to obtain the chromatogram at 280 nm, nevertheless, i cant export the CDF file of that chromatogram since only the 0 nm channel is available. How can i change the channels to obtain the chromatogram at a desire wavelength? is there and option to return the software to its default settings? 

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