Ansel is Nvidia’s tool that is used for making high resolution, 360° and stereoscopic screenshots. You can move around freely in a paused scene to capture your character’s best side.
Sadly during action ALT+F2 is quite hard to hit. Let’s remap the key.
Launching the configuration utility
To launch the utility hit Windows+R and paste this path:
You should be greeted with this window:
The input hotkey is used to remap, hit the key or the combination you wish to use then confirm and save.
I have tested this on Windows 10 with the Witcher 3.