GNOME : gsettings

gsettings configurations :

GSettings — High-level API for application settings

Set the screen blank timeout settings to 30 min
Timeout for blanking the screen (seconds; 0 = never):


gsettings set org.gnome.desktop.session idle-delay 1800 

Set the Screensaver lock timer
Timeout for locking the screen after blanking (seconds; 0 = instant):

gsettings set org.gnome.desktop.screensaver lock-delay 0

Make the icon smaller

gsettings set org.gnome.nautilus.icon-view default-zoom-level 'small'