How to remove ssh-rsa?

How to remove ssh-rsa?

How to go from this:

server_host_key_algorithms: (3)
|       ssh-rsa
|       rsa-sha2-256
|       rsa-sha2-512

to this:

server_host_key_algorithms: (2)
|       rsa-sha2-256
|       rsa-sha2-512

I do not find where this is configured.