we recommend adding widgets from Appearance->Widgets and not from the Customizer, because from the customizer you can only add widgets to the sidebars that are actually visible in the current page you are seeing.
This theme features 3 sidebars:
- Right sidebar: visible in all the templates with sidebars, posts and archives (not series)
- Footer sidebar: requires to enable footer widgets in Appearance > Customize > Footer >Enable Footer Widgets
- Series sidebar: visible only in single series pages. Please go in Customize > Series settings and choose “Boxed with sidebar”
Go in Appearance->Widgets to add widgets to your sidebars. This theme features several custom widgets that will be explained in another chapter.