GNOME Tweak Tool is an application for changing the advanced settings of GNOME 3. Below are the features that GNOME Tweak Tool can perform. Reset to defaults settings Startup application management Enable Application menu Dynamic or Static Workspaces creation Disable all extensions Install/Update/Uninstall extensions Font size, hinting and anti-aliasing Icons on Desktop Clock: Show Date and Seconds To install GNOME Tweak Tool open terminal and run apt-get update and then apt-get install gnome-tweak-tool Once it install GNOME Tweak Tool , run gnome-tweak-tool to run the application