These features and improvements new in Revit 2020 help connect design to fabrication with tools for higher fidelity modeling for detailing, fabrication and construction of concrete.
With Revit 2020 you can create more advanced wall geometry with the ability to draw elliptical walls and curtain walls.
You should only use this option if it takes your computer a long time to dim the desktop, which would likely be due to a hardware or driver issue. The dimmed desktop environment is actually a special, secure desktop that running applications can’t interfere with.
Windows will ask you for permission when you install applications or when those applications want full system access, but you won’t see UAC prompts when you change most Windows operating system settings.