Turn off notifications.

I bought Razer Ornata V3 X keyboard. How to turn off the info bar on the screen in any game? I mean the bar with FPS, CPU temperature and graphics etc. - on the top left. I go to 'Settings' Chroma, turn off notifications and nothing. I go to 'Loaded games' Synapse, I remove the game from the list altogether, nothing - the stubborn bar still won't go away.