Enable/Disable Customizer Sections
The WordPress customizer is awesome but it can also be a bit slow when you have tons of options. For this reason, a panel where you can quickly and easily enable/disable different sections is available. For example if all you are changing is the header you can disable everything except the header before launching the Customizer to make things blazing fast.
Disabling a section simply stops it from showing up in the Customizer it will NOT reset any of your options.