Hi, I have the same problem, I added a new sidebar, saved, but the post or page I do not have the option to select it, why?
Admin user > Appearance> Custom Sidebars > New Sidebar > “New” (name ex.) “description” sidebar about > “create Sidebar” I see it in “All the Custom Sidebars”
But when you are editing the page in the “about” “page: right sidebar”…. the “Sidbars” is empty….
Tnx
e.