Screen is a full-screen window manager that multiplexes a physical terminal between several processes, typically interactive shells.Using GNU screen all windows run their programs completely independent of each other. Programs continue to run when their window is currently not visible and even when the whole screen session is detached from the users terminal.

Well let’s see how to add vertical split screen:

1.download GNU screen from click here to download

2.now download the patch file click here

3.now enter the directory you just created screen and type this:
patch -p1 < ../wrp_vertical_split_0.3_4.0.2.diff

4.always root now type:

./configure --prefix=/usr && make && sudo make install

To compile and install the new screen version of the patch.

5.Reboot and restart screen, now to see if the patch worked (so to make split vertically),

press SHIFT + V

click here for more info