Now though, and again regardless of whether it is the light or dark theme in use, elements behind the quick settings interface will remain somewhat visible — as shown below. (androidheadlines.com)
The brightest levels seem way too bright, but the help text in the brightness setting interface suggests such levels are only intended for use in «brightly lit rooms». (daringfireball.net)
You'll have to disable the notifications those applications use in their individual settings interfaces. (howtogeek.com)