Same issue. Thanks for explaining that it’s written in white on white background.
This should be a very easy and fast fix, Evernote? Simply change font colour and update. Very awkward.
For others, tap at top right for save (just below battery icon in my screenshot) and top left for cancel (just below I’ve ‘Ice’ in my screenshot). Buttons are there bjt invisible.
To be clear, this relates to when scanning a document then
SEND >SHARE > Save to Files
which is a VERY useful send option.