Hi,
You can use the Get-AzApplicationGatewaySslPredefinedPolicy PowerShell cmdlet to get the pre-defined policies that are in use.
More information here:
Configure TLS policy versions and cipher suites on Application Gateway
https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-configure-ssl-policy-powershell#list-pre-defined-tls-policies
(Please don't forget to mark helpful replies as answer)
Best regards,
Leon