A lot of people don't understand how crypto works, including people whose jobs really ought to require them to know. Someone asking for a screenshot of a crypto wallet is probably just trying to think of what the closest equivalent to a bank statement is.
This person might know the difference between custodial and non-custodial wallets. If it's a custodial wallet, they might be expecting a screenshot from the custodian website showing your wallet address and name (similar to a bank statement).
You very often can't reason with people like this or explain things to them. Just send them what they ask for. The request︀ is easily fulfilled.