L/R set timer confusion

I don’t really get the L/R set timer. It seems like it would be best if there were just two timers, but what’s the best way to have it set up with one?

I tried the “rest between L/R sets” but I guess that just adds more time between each L/R set, which does make sense with the description, it sets the timer to half for the L and full for the R.

I guess I’m just not looking at this right. If I just want to have a consistent rest time for L and R what should I do?