To enable anonymous pull access on an Azure Container Registry (ACR), you can follow the steps below:

Prerequisites:

1. You need to be using the Standard or Premium tier of Azure Container Registry, as the anonymous pull feature is available only in these tiers.

Note: By default, access to pull or push images from an Azure Container Registry is only available to authenticated users.

To allow everyone (even unauthenticated users) to pull images, you can enable anonymous pull access using the Azure CLI.

Run the following command in the Azure CLI:

az acr update --name <yourRegistryName> --anonymous-pull-enabled true

Replace with the name of your Azure Container Registry.

Optional:

If you want to disable anonymous pull access later, you can run the following command:

az acr update --name <yourRegistryName> --anonymous-pull-enabled false

I tried to find a way to do by Azure Portal(GUI) but didn't find way. If you know then please let me know.