Azure portal

Azure portal provides many similar abilities to the Office 365 portal, but as you can see here, the user interface is quite different. Most Office 365 administrators will probably be more comfortable working primarily within the Office 365 portal, and using Azure portal only when it is needed:

Managing Azure AD in the Azure portal

Here's the URL to go directly to the Azure AD blade: https://portal.azure.com/#blade/Microsoft_AAD_IAM/ActiveDirectoryMenuBlade/.