Question: I faced a bug with Android Studio 3.0 Preview. When I plug the device, small useful checkbox is missing. 

[![Screenshot](https://i.stack.imgur.com/EDtiV.png)](https://i.stack.imgur.com/EDtiV.png)

Does anybody know how to enable it?

Answer: 
I had the same issue. You need to disable instant run in your android studio settings, follow below steps:

* Open the Settings or Preferences dialog.
* Navigate to Build, Execution, Deployment > Instant Run
* Uncheck the box next to Enable Instant Run

After that you will have this option and if you will enable instant run again android studio will remember your selected device
Other possibilities for AS 3.0 (limited to your current project AFAICS):

* Select the `Use same device for future launches` option in your project through `Run -> Edit Configurations... -> General -> Deployment Target Options -> Use same device for future launches` (`Target` should be set to `Open Select Deployment Target Dialog`).
* In the same menu as above, select `Emulator` from `Target` and then choose your preferred AVD through `Prefer Android Virtual Device`.