Hello @Michal Furmankiewicz ,
Welcome to Microsoft Q&A Platform. Thanks for posting your query.
Azure Network Watcher resources should be visible in the NetworkWatcherRG even when they are enabled via Azure portal. I can see the same in my subscription:
When you create or update a virtual network in your subscription, Network Watcher will be enabled automatically in your Virtual Network's region.
When you enable Network Watcher using the portal, the name of the Network Watcher instance is automatically set to NetworkWatcher_region_name where region_name corresponds to the Azure region where the instance is enabled. For example, a Network Watcher enabled in the West Central US region is named NetworkWatcher_westcentralus.
The Network Watcher instance is automatically created in a resource group named NetworkWatcherRG. The resource group is created if it does not already exist.
If you wish to customize the name of a Network Watcher instance and the resource group it's placed into, you can use PowerShell, the Azure CLI, the REST API, or ARMClient methods. In each option, the resource group must exist before you create a Network Watcher in it.
Please refer : https://video2.skills-academy.com/en-us/azure/network-watcher/network-watcher-create
Could you please check the subscription in which the NetworkWatcherRG is deployed in and if you are looking at the right one by checking the subscription ID in the Overview tab of NetworkWatcherRG? If multiple subscriptions are selected in the your Azure portal directory, you will be able to see all the NetworkWatcherRG deployed in all the selected subscriptions.
If you are checking Network Watcher resource itself, make sure that in the overview tab, the correct subscription from the dropdown is selected.
You could also try to disable the resources, delete the resource group and recreate & re-enable the Network Watcher via Azure portal to confirm if there is an issue in your case.
Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.
----------------------------------------------------------------------------------------------------------------
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.