Standard pricing tiers are not selected in Azure Security Center Subscription Pricing, this disables threat detection capabilities.
At this time, the console UI does not have remediation steps available. For possible CLI remediation, see the product documentation (below) or use Terraform.
In Terraform -
References:
https://learn.microsoft.com/en-us/azure/security/
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/security_center_subscription_pricing#tier