Lead Developer
Hi there,
It’s not easy I’m afraid – you’ll need to look into some functions like:
$wp_customize->remove_section
$wp_customize->remove_control
More information:
https://gist.github.com/generatepress/f04d0881f806e84be0ac
http://wordpress.stackexchange.com/questions/58932/how-do-i-remove-a-pre-exising-customizer-setting