I am trying to buy PRV using USDC but there is a bug in the Trade pane in Incognito app.
If the amount can be written in 3 lines, the “Confirm” button appears in the bottom:
If the amount occupies 4 lines, the button doesn’t show and it is not possible to scroll down:
Maybe you should limit the decimal places shown to avoid that problem. As the text says “Buy at least”, you can just truncate since it will still be a true statement.