An approach is to try to add this as a peak by selecting (Add Positive) then mark its start and end, then try the tail tangent.

Did you try to play around with the (Global Threshold) or (Global Peak Width)? this sometimes come in handy to make very small peaks detectable but if the chromatogram is noisy, you may find many unwanted small integrated peaks. You can find this in (Method)-> (Integration) tab-> Select your desired...

Hello I'm using the 8.8 version using uni ruby script, I got stuck in a point where I want to update a value in Method UI using SetDouble, but the value doesn't seem to be updated Ex: def Init Method().AddChoiceList("SyringeSizeList", "Syringe Size[uL]", $syringeSize[0],"ChangeInjectionVolume") for ...