I have a question maybe stupid

https://www.dropbox.com/s/ef4zkj2aibtaz ... 1.pdf?dl=0
I have four triangle elements.
https://www.dropbox.com/s/xtn1zax3fv61z ... o.pdf?dl=0
At this moment, I need a structured mesh with two triangle elements per quadratic elements: how I can obtain this?
I have already tried to reset mesh data and restore the default parameters in the preferences menu.
thanks