Question: I have installed magento2.1 in local pc. After I created one custom theme then, I Go to change my custom theme via admin **Store -> Configuration -> General -> Design** But Here Theme Selection option is not there , Is magento 2.1 Bug? 

Reference: 

[![enter image description here](https://i.stack.imgur.com/a9Bs5.png)](https://i.stack.imgur.com/a9Bs5.png)

Answer: 
In magento 2.1 they change the menu for theme configuration. you can navigate to theme configuration by 

**Content -> Design -> configuration** 

[![enter image description here](https://i.stack.imgur.com/UEm2T.png)](https://i.stack.imgur.com/UEm2T.png)
No That is no bug

replace 2.1 in

Please go to content-> Configuration -> edit