RPI 5 - Graphical interface buggy on display stop/start

Hi all, I am using a RPI 5 as kiosk display which displays a fullscreen webpage using chrome, it's connected via HDMI to an external screen. The screen automatically shuts down at 8PM to save power and start again the next day. The issue is that when the screen boot again, the UI glitch with 2 navbars and chrome is no longer in fullscreen. How could I solve that? Thought of forcing the display output even when screen is off but without success so far :/ Regards,