Q:

How to say when an application is taking the half of your screen on a computer

When using a computer I know when the application is taking the entire screen we call it "full screen" or "your application is in full screen mode". 
And so how is it called when a application is taking half of the screen (in order to display 2 applications for instance one on the left and one on the right).
Thanks in advance:

A:

Mostly, it is called "Split-screen mode".
"Half-screen mode" and "Shared-screen mode" works alright too.

A:

In addition to Bella's answer, I occasionally hear the terms "docked" and "snapped" (as in, "The application is docked to the left side of the screen," or "Snap the application to the right side.")

