With Bstone you get four Sidebar options. the right sidebar, left sidebar, both sidebars and an option that disables the sidebar.
You can find settings under Appearance Customize Layout Sidebar
You can set a sidebar for entire site with Default Layout option.You can set a sidebar for particular Pages, Blog Posts, Blog Post Archives as well.
When one of the sidebars (left/right) is set, you can adjust its width.
Sidebar Border Size
It allows you to set sidebar border size.
Widgets Border Size
It allows you to set sidebar widgets border size.
Bstone also allows you to manage sidebars for a particular page or post through the meta settings.