Install plugin. Activate plugin. Rebuild and restart. Go to Admin -> Customize -> Widgets (or search widgets in the admin search)
Left or Right Sidebar
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Is it possible to switch the sidebar from the right side of the screen to the left? It would be nice to have the option to change it's location.
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Depending on the theme you are using you can change their locations in the template files. For example for lavender just move this between line 1 and 2. Would have to do it for the other pages as well like categories.tpl etc.