If you want to change the default simply run the below command.
gsettings set org.gnome.desktop.interface text-scaling-factor 1.2
To reset the value to its default settings, run below.
gsettings reset org.gnome.desktop.interface text-scaling-factor
If you want to change the default simply run the below command.
gsettings set org.gnome.desktop.interface text-scaling-factor 1.2
To reset the value to its default settings, run below.
gsettings reset org.gnome.desktop.interface text-scaling-factor