when the radio/ screen is in the basic display (like yours is on) and not showing the actual station list and/ or navigation map to the right, the display will be a bit darker… consider it sort of in screen saver mode.
if you want to see more info and brighter display, just click the radio or media button (whatever you happen to be listening to) and it will go back to the brighter and more informative menu.
You can try to go into settings/ display/ and set it brighter or go swap day or night mode and see if it helps.
But, more likely, the menu that you see and attached a pic of above, will stay that level of brightness.
hope that helps?