If you want to unpublish the app from play console then you have to follow the following steps.

1. Select app which you want to unpublish from App List.
2. Turn off managed publishing. If it is on then Unpublish option will not be selectable.
3. Got to Test and Release section from side panel
4. Click on Setup Section
5. Click on Advance Setting
6. Click on Unpublish tab and then at bottom Click Unpublish.  7) All Done.