D365 CE - Set Classic UI or Navigate to Classic UI

With the introduction of the power platform and UCI lot of the settings in customer engagement is evolving rapidly. One of those were, the UCI is the default interface and not able to get into the classic UI.

Now I am on UCI, how to I navigate to the settings area that controls UCI/Classic UI?

Option 1:

• Using the setting gear icon on the right hand top corner and select advanced setting.
• Navigate to Settings => Administration => System settings

Option 2: 

• Under powerplatform admin portal(URL below), select your environment 
• "https://admin.powerplatform.microsoft.com/environments"
• Navigate to "Settings" gear Icon and select "Behaviour" under "Product" section

Option 3:

• Go to URl "https://<your org>/main.aspx?settingsonly=true"
• Navigate to Settings => Administration => System settings

Under general tab you would see below options,(In powerplatform admin you might see this under basic behaviour section)

• Set "Use the new Unified interface only" option to No