Hide/Show Hud
Method #2
In-game press "CTRL+F9" or "F9" to toggle the HUD
Method #2
In-game press "Tilde (~)" to open up the console and enter:
debug_nogui
Screenshot
Hearts of Iron IV Hide Hud \\Hearts of Iron IV Remove Hud \\Hearts of Iron IV Toggle Hud Off \\Hearts of Iron IV Disable Hud \\Hearts of Iron IV Without Hud \\Hearts of Iron IV Turn Off Hud \\Hearts of Iron IV Hud free