Accessing Android Studio properties window?

In the new Android Studio Version 3.1.2, the name of the Propierties Windows is "Attributes".

Look at this picture: Attributes basic view And, if you want to see the complete attributes, simply click on "View all attributes": Attributes full view

How to restore windows?: restore windows

I had the same issue than found that the properties window was always there but I had to drag it out with my mouse. Just go to the far right vertical bar in Design mode then drag to the right when your mouse turns into horizontal arrows pointing away from each other. Hope this helps!

Switch to design view. Click "Design" tab at bottom-left work area.