From Portal:
1. Login to the AWS Management Console and open EC2 console at https://console.aws.amazon.com/ec2/.
2. Select ‘Load Balancers’ (Left Panel)
3. Select the Application Load Balancer
4. Select ‘Listeners’ tab
5. ‘Edit’ the ‘Listener ID’ rule that uses HTTP
6. Select ‘HTTPS’ and other options in the ‘Protocol : port’

From TF:
Use HTTPS protocol instead of HTTP protocol :
resource “aws_lb_target_group” “test” {
load_balancer_arn = aws_lb.front_end.arn
port = 443
– protocol = “HTTP”
+ protocol = “HTTPS”
ssl_policy = “ELBSecurityPolicy-2016-08”
certificate_arn = “arn:aws:iam::187416307283:server-certificate/test_cert_rab3wuqwgja25ct3n4jdj2tzu4”
default_action {
type = “forward”
target_group_arn = aws_lb_target_group.front_end.arn
}
}

From Command Line:
To modify the existing load balancer , run:aws elbv2 modify-listener –region us-east-1 –listener-arn ARN –default-actions file://FILE.json
OR
To create a new load balancer , run:aws elbv2 create-listener –region us-east-1 –load-balancer-arn ARN –protocol HTTPS –port 443 –certificates CERTIFIATE –ssl-policy POLICY –default-actions Type=forward,TargetGroupArn=ARN

References:
1.https://docs.aws.amazon.com/elasticloadbalancing/latest/application/create-application-load-balancer.html
2.https://docs.aws.amazon.com/elasticloadbalancing/latest/application/tutorial-application-load-balancer-cli.html
3.https://docs.aws.amazon.com/elasticloadbalancing/latest/application/application-load-balancers.html
4.https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-listeners.html
5.https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener