disable right click , copy and paste features in AWS SSM

You'll need to configure the terminal settings and possibly modify user permissions or shell settings. With that being said, completely disabling these features might not be possible due to the nature of the remote sessions or user environments.

You can try and restrict the commands that users can run with via IAM policies or session manager policies, eg,

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Deny",
            "Action": "ssm:SendCommand",
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "ssm:DocumentName": [
                        "AWS-RunShellScript",
                        "AWS-RunPowerShellScript"
                    ]
                }
            }
        }
    ]
}