how to hide the hud and have that cinematic view when in a fight?

[Kryptic]

as the title says, plus ive looked in keybinds and cant find the key and my smooth brain even tried the k key but nothing seemed to of worked

[Funky Monk]

iirc it should be the K button

[SheiK]

alt plus K

[Garatgh Deloi]

It's K for just removing the UI and alt + K for removing the UI and adding the thematic letterboxing.

K:
https://steamcommunity.com/sharedfiles/filedetails/?id=2944327928
Alt + K:
https://steamcommunity.com/sharedfiles/filedetails/?id=2944327940

Use the same command again or Esc to exit.

P.S Now that i think about it, any button might work to exit, haven't tested it.