You're a genius, horshack. That absolutely works! Brought back my scroll arrows. I'd disabled the animation options a while ago.
I've re-enabled all three: window animation scale, transition animation scale and animator duration scale. I noticed that the higher the duration selected, the longer the arrows stay on screen. 0.5x is a bit short but 1x seems about right. Shame animation has to be on though as I find things much quicker without. Nevertheless, I'm glad to have the arrows back.