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Plugins: Simple Page Sidebars
What it is: Designed for simplicity and flexibility, Simple Page Sidebars gives WordPress users, designers, and developers the ability to assign custom sidebars to individual pages–without making any template changes. Existing sidebars can also be assigned in quick edit and bulk edit modes, helping save you time.
- No more site-wide, generic sidebars. Each page (or section) can have its own widgets.
- Complete control over the names of your custom sidebars.
- Assign the same sidebar to multiple pages.
- Modify a page’s sidebar without creating an unnecessary revision.
More info: https://wordpress.org/plugins/simple-page-sidebars/