This configuration can be modified in one of two ways.
Through the Safeguard Desktop Client:
Navigate to Administrative Tools > Settings > Appliance > SSH Algorithms.
Fill out the fields for Public Key, Cipher, KEX and MAC with a comma separate list of the algorithms you wish to be enabled.
Through the API:
Login to https://sppaddress/service/core/swagger
Click the Authorize button and login with an Admin account.
Scroll down to SSHAlgorithms and expand it.
Perform a GET to review the list of currently enabled algorithms.
Perform a PUT to modify the configuration.