There are two methods to hiding UI elements - the UE4 generic console unlocker utility has assigned the keyboard's DELETE key to this, however there is also a debug option for this within the YsNet debug menu.
You can toggle free camera by pressing T on your keyboard and to return to Ryo, press ~ (tilde key) or ` to activate the UE4 console and type `ToggleDebugCamera` and hit enter.
Wish there was option on PS4 for this
Wait, you plugged a keyboard on your PS4 and you got inputs working out of Shenmue 3?I tested this on PS4 last night with no success, unfortunately. However, feel free to plug in your keyboard if you want to use the PC keyboard control scheme on your PS4 - I couldn't get the mouse to work, though.