January 2020
I also had an issue with Need for Speed, being a Windowed game with no option to Full screen. Heres how you Fullscreen, not going to Waste Your Time
Startup: To start up in Full Screen
1. Open Up Origin
2. Click on Need for Speed [Do Not Launch]
3. Go Into Settings [Click on the Gear Icon]
4. Click on "Game Propories"
5. Go to "Advanced Startup Settings"
6. Copy and Paste this and Run the game " Fullscreen=true "
Quick Solution
When Inside the game, Press " ALT + ENTER " at the same time. So if you tab out and it goes to Windowed, just do ALT + ENTER
May 2020
Not working. I did that and it does not work. The Alt Enter was pretty obvious, but it just triggers that sound of when you press an invalid command on windows. It does not work either. I use Windows 10 64bits