Upgraded firmware version. I am assuming this is what you meant by 1.3.23?
Now a small exercise now you have Decode sorta sorted.
Slow the timebase right down to just above Roll mode so to have several/many packets on the display.
Now press the timebase knob to get into Zoom mode and then use the timebase again to select how large/small your zoomed data stream portion is.
Doing this you can a heap of packets on the display, all decoded and data visible in the List when it's turned ON.
The highlight line is 1/2 way down the list and you can scroll though it with each decoded line time referenced in relation to the trigger point.
Once you get into advanced triggering with the Decode trigger suite, again each line is time referenced WRT the trigger point.
Have fun.