I frequently find it hard to tell which line is which when I want to review more than a few data channels.
I feel that having separate panels for e.g. "speed, rpm" and "accelerator, brake" would make them easier to read.
It may even allow increasing the number of readable data channels from 4 to 8.
I understand that back when RaceChrono was originally designed, perhaps most phones had tiny screens.
Personally I use a 5.5" phone now (Pixel XL) and sometimes even a 7" tablet to review data,
and feel like I could certainly squeeze more data on the larger screen.