Well, when?
When you play on Steam. 
In all seriousness with the space limitations on mobile there may not be a feasible way to make the ap bar visible at all times. I did like the old bar better, however, as it was much easier to see what ap pools were gained/drained by abilities like Aggressive Recon and Furious Charge.
A simpke fix would be to allow screen rotation. I play Puzzle Quest on my 8 inch tablet screen and landacape allows for so much more to be displayed.
Even if it’s not always visible, it’s still accessible by swiping the character portraits to the left (at least on Android).
old ap bar waaaay more better, slide right/left not much helping especially for ap drain/stealer except for obw.
https://forums.505go.com/discussion/30408
Hopefully when something like this gets incorporated.