After the Android Studio 2.2 update, there is no Emulator
Tab in Edit Configurations
window.
If you want to scale your emulator, you just need to use this keyboard combination:
To scale up: Ctrl + ▲
To scale down: Ctrl + ▼
If what you want is scaling by a percentage or getting a 1:1 display, maybe you should try modifying these two files:
(I don’t know if this one will work since I didn’t have a chance to try.)
C:\Users\YOUR USERNAME.android\avd\Nexus_XX_API_XX.avd\hardware-qemu.ini
C:\Users\YOUR USERNAME.android\avd\Nexus_XX_API_XX.avd\hardware-qemu.ini