Hello, Plusout,
In regards to the settings of the theme and related plugins, you need to do the following:
1/ Activate the child theme;
2/ Go to the Customizer and export the options as shown in the screenshot below: https://gyazo.com/6e911ef032ccbe80d06c33ab84fc14e7;
3/ Reactivate the parent theme and export the options again;
4/ Import the options of the child theme to the parent theme;
5/ Check if everything works;
6/ Restore the options of the parent theme by importing them.
Please, be careful and do not mix up the option files, also do not delete them.
Kind Regards,
8theme team