How to connect SFTP with specified secure exchange algorithms

Currently I am using winscp version number 5.13.3 and per requirements I need to connect client SFTP with following key exchange algorithms on port number 22.

DH_GROUP_EXCHANGE_SHA256
ECDH_NISTP256

please advise!

See https://winscp.net/eng/docs/ui_login_kex

You cannot specifically request SHA-256 for DF. But if it's an requirement, I assume that the server does not allow SHA-1 at all, so you do not do need to configure anything on WinSCP side. It will pick the best algorithms from those supported by your SSH server.