1. reset all the gnome settings

dconf reset -f /

2. tricks

minimize desktop icons

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

enable alt-f9 and alt-f11

gsettings set org.gnome.desktop.wm.keybindings minimize "['<Alt>F9']"
gsettings set org.gnome.desktop.wm.keybindings maximize "['<Alt>F11']"