Sorry if this is already been mentioned/discovered but you can take great screenshots in Witcher 3 w/out the UI showing using this "photo mode" mod/method: http://www.gameranx.com/updates/id/28216/article/the-witcher-3-photo-mode-tool-allows-you-to-compose-fantastic-screenshots/

I wish someone would automate it into a one button press thing, but at least it works.

Sorry if this is already been mentioned/discovered but you can take great screenshots in Witcher 3 w/out the UI showing using this "photo mode" mod/method: http://www.gameranx.com/updates/id/28216/article/the-witcher-3-photo-mode-tool-allows-you-to-compose-fantastic-screenshots/

How it works:

• Install the mod files into your Witcher 3 folder (linked above)
• Launch the game / load your save / start playing
• Press "F2" and a console panel will slide down
• Type "dlgshow" and press "ENTER" to HIDE the UI (yes, no idea why the command has the word "show" in it)
• Press "F2" to hide the console panel
• Press your keyboard shortcut to take a screenshot w/whatever 3rd party screenshot utility you use (I use Fraps and Ctrl+PrtScreen)
• When done, press "F2" again, type "dlghide" and press "ENTER" to bring back the UI
• Press "F2" again to hide the console and go back to playing the game!

It sounds (and is) a bit tedious but you get faster at it after a few times - and it's worth it for the great screenshots. I wish someone would create a single-button-press option for UI-free screens, but at least the above works.