It's impossible to disable taking screenshots in a web page.
You can disable the right click menu, but that only inconveniences ordinary users who need the right click menu for other purposes. It makes no difference whatsoever to a fraudster who will know how to take screenshots without using the right click menu.
My daughter had a smishing text and rang me up (partly to confirm to herself that her account really wasn’t disabled) about it. I checked her account for her from my iPad and it was fine …
She reported that the screenshot was taken in 2018 (from the copyright info at bottom of page) so the date would be another clue. The ‘contact us’ and other links at the bottom of the page didn’t work … another clue it wasn’t for real … 🤡