Increase the spacing between letters on the "all files' index
When in all files, the vertical (index) alphabet line has the letters too close together for my adult fingers to hit just one. When you are holding and instrument, with an ipad pro wiggling around on a mic stand, it's pretty hard to hit an I or an n the first try without getting a couple of neighboring letters and then starting over. It isn't practical to grab a "poker" and still find the piece you want in a timely fashion. I've been using this system for over 3 years in a 'real world' situation and it does very well except for this one weakness.
Apple sets that right hand index. I don't know how to change it.