New patch (Chernobylite)

The new patch added the ability to turn off the interface with CTRL + ALT + [,who ever it is running.

For everybody willing to make perfect screenshot or virtual photography without the game interface: we've added the option to disable the UI using the CTRL + ALT + [ combination of keys. This shortcut disables the UI completely and permanently, to invert it you need to reload the game. We are working on a more elegant solution.

A full description of the patch on the link.
https://steamcommunity.com/app/1016800/allnews/