[Terminal] One terminal open multiple screen

You can do it in screen the terminal multiplexer.

• 
  To split vertically: ctrla then |.


• 
  To split horizontally: ctrla then S (uppercase one).


• 
  To unsplit: ctrla then Q (uppercase one).


• 
  To switch from one to the other: ctrla then tab

EDIT, basic screen usage:

• 
  New terminal: ctrla then c.


• 
  Next terminal: ctrla then space.


• 
  Previous terminal: ctrla then backspace.


• 
  N'th terminal ctrla then [n]. (works for n∈{0,1…9})


• 
  Switch between terminals using list: ctrla then " (useful when more than 10 terminals)


• 
  Send ctrla to the underlying terminal ctrla then a.

Reference :

Linux - How to split the terminal into more than one “view”?