You can add and configure sidebars here. But, to add tools to the sidebar you should go to Appearance > Widgets.
How to Add a Sidebar?
- Go to Appearance > Customize > Sidebar Settings
- Click Add new sidebar.
- Give the sidebar a name.
- Click Publish.
You can see the new sidebar in Appearance> Widgets. Add a widget to the sidebar and click Save to configure the newly created sidebar.
How to Configure Sidebar?
- Go to Appearance> Customize> Sidebar Settings
- Select Sidebars for various Pages, like Blog Page, Single Page, Single Post Page, etc. The sidebar selected under the particular pages will only be displayed on the page. For example: Blog Page
- Sidebar appears only on blog page.
- Click Publish.
