Disable files app swipe left to open?

Hi all. I just got a new iPad 9th gen (had an old mini for a long time). I am using the music app ForScore, but that does not especially matter except to explain my problem: to turn music pages you can swipe left. However, if I start the swipe at the wrong place, I get the files app (or at least part of it) instead. Big problem while actually playing/singing since it covers up the music and requires a different grip to dismiss it! You get many measures behind!

I can't find any documentation that even talks about this left swipe starting the files app in the first place. But I would like to disable that feature. I looked in "Settings" and did not see the files app as having any settings. I can disable ForScore from using iCloud, but I do want it to sync with other devices that way; however, I never need to look at the actual files app for that.

Any ideas? Thanks.