Vertical leaf is a sign of strong tugor pressure, tugpr pressure gives an idea how much suction force exists within the plant from all the transpiration going on.
Not good or bad, it gives an idea of how much workload the plant is dealing with, how fast water is being used through cooling, transpiration, Cellular respiration.
It's generally a sign things are ticking along efficiently as water is being released by plant efficiently. More water released, more suction force or turgor pressure.
Could also be a sign that light intensity is too high and big leafs are trying to limit photosynthesis by literally going vertical to reduce photosynthesis as much as it can.
I'd lower light intensity maybe to 20-30% see if you can get leaves with nice erect pressure horizontally. Right now she is telling me it's a little too much. But just a little.
Good luck.