Move the position of or hide the brightness/volume pop ups on high sierra
SIP needs to be disabled, then I ran these:

sudo defaults write /System/Library/LaunchAgents/com.apple.OSDUIHelper Disabled -bool YES
sudo defaults write /System/Library/LaunchAgents/com.apple.BezelUI Disabled -bool YES
sudo reboot


And it's worked, I no longer see the Overlays.