Sidebar and Widget area missing in Customize

Hello everyone,

For a few days that I have a small problem that I dont know how to solve it, i’m full of search online without any sucess. =(

But explaning the sittuation:

I have the sidebar 6 and 8 missing in the Apparence / Customize.

I went to Layout Manager / Home and selected the Widget Area 6 to be display the Widget Area 6 and the Widget Area 8 to display the Sidebar 8 but these 2 widgets areas dont show up in the customize.

Any ideas how to fix that issue?

Thanks in advance =)