Assistive Access UI changes - feature request

Hi there, I don't believe it's currently possible to edit the Back Button size or appearance in Assisitive Access. The large size and location is actually a barrier to some users of AAC apps running in Assistive Access mode - because of the screen real estate lost and visual distraction created. Would it be possible to have a setting in a future iOS build that allowed the Back button to be temporarily hidden or at the very least signficantly reduced in size. I can provide screen caps of several AAC apps if that would be helpful. I am not alone in having this concern - several other AT Professionals and SLPs have made the same observation