Three rows UI's goal is to hide as much unnecessary info as possible to keep focus high and eye movement low
the UI is split into three rows:
Row one is rotational abilities and short cooldowns.
Row two is major cooldowns.
Row three is Defensive cooldowns and utilities.
If one ability spends more time off CD than on it'll be hidden by default and only shown when on CD
Cooldown numbers are tied to the default UI numbers, you can turn them on and off in interface>ActionBars>Show numbers for cooldowns
THREE ROWS is designed with spell alerts off, but you can of course turn leave them on if you prefer.
Separate downloads are available on my wago profile