Three sets of options: Triangular or Linear; Used or Unused; "Show on Status Bar: On|Off". "Triangular" puts the form least recently used takes the upper-central position, highlighting which Form to use next, while "Linear" just goes from left to right. "Used" notes which Forms you've already used (such that you should use whichever form isn't highlighted/saturated, while "Unused" notes which Forms will benefit. The player can choose to show Flow: Opo-opo, Flow: Raptor, Flow: Coeurl, and Flow: Formless on the status bar or not. The default is Triangular, Unused, Off. A new rune has been added for Formless (from Perfect Balance).
During Perfect Balance, these runes are purged to show only progress towards Blitz. Upon completing Blitz, this gauge element will return to its normal setup, with two Formless runes shown if using the "Used/Show Buffs" option or all three Forms' runes highlighted if using the "Unused/Show Buffed" option, both of course meaning that your next skill will be fully empowered.