Homepage area isn't displayed in the Customizer under widgets


in my installation the homepage area isn’t displayed in the customizer under widgets. But unter widgets in the dashboard I see it. This would be no problem if the parallax widget would be displayed on the homepage, but there is nothing to see.
I have installed and activated the Shapely Companion and jetpack Plugins.
What can I do?

Hello there,

I hope you are doing well today.

This is strange issue. Please disable any third party plugins that you may have active to see if one of them may be causing a conflict here.

Best Regards,