Are screenwriters allowed to have a Voice or style? 

I say yes, and here's how to find yours:

https://www.youtube.com/watch?v=kOLHBFi6ExA

That's a link to a 13-minute video that guides you through the whole process--by the end, you'll know what your style is--or could be.

At the end, I mention an advanced Screenwriting course that I'm teaching for four consecutive Mondays, starting on July 19. The hours are 7 pm to 9.30 pm London time, that's 11 am to 1:30 pm Pacific, or 2 pm to 4:30 pm Eastern. It's on Zoom, so you can join us from wherever you are.