Try disabling "Shortcuts" in the iOS keyboard settings - this hides that toolbar.
Best posts made by james_a_craig
RE: Problem with Pythonista on 2018 iPad pro
Disabling "Shortcuts" in the iOS keyboard settings fixed this for me (after a close and reopen of the app) by hiding the toolbar. Obviously it'd be handy to have it just laid out nicely instead of removing it, but it's a reasonable compromise in the meantime.