It has been a little bit challenging to get a nice overview off all your devices in Azure Active Directory. The devices which are managed by Intune were not a problem, but the devices which are Azure AD joined or Azure AD registered (and not Intune managed) could only be found when going to the user account which owns the device, on the devices tab.
Microsoft now added a new feature in Azure Active Directory (in Preview) which shows a nice overview of all devices which are Azure AD joined or registered. It can be found in the Azure Portal under Azure Active Directory.
When opening All devices you get an overview of all the devices, with information like OS, OS version, join type etc.
From here you are able to manage the devices. When you click on the three dots it gives you the options Manage, Disable, Delete and Pin to dashboard.