My sidebar won't display- even after deleting plugin

Hello. I am using the Custom Community theme and tested this plugin on a test site for compatibility. It seemed to work just fine. Unfortunately, once I used it on my live site it began to remove the right sidebar from all pages I used it on. Even after disabling the plugin and then deleting it, my right sidebars won’t show on ANY new pages.

Please someone tell me which files I need to replace with backup files to repair this damage?

https://www.ads-software.com/extend/plugins/per-page-widgets/