A free mod for Witcher 3, by CAPA.
The HUD Killer for The Witcher 3:
If you're searching for a simple way to hide the heads-up display (HUD), try this application.
It's a simple way to hide the display, it's not a lot of things, but it does what it does very well.
To use this, you have to do a couple of things.
First, you need to open the options of the game and find the tab called "HUD settings".
Then, you need to find the option called "Hide HUD".
After that, you need to add the lines that you want to hide and you're done.