Android emulator screen fills up only some fraction part of actual android emulator screen

Question

First thing first,

Using Android Studio 2.3.3

Problem:

My emulator screen is covering the only partial amount o

Answer 1

Open the Emulator and press Ctrl+Up_Key to increase the scale and Ctrl+Down_Key to scale down. (Cmd+KUp / Cmd+KDown if you are on mac)