Hi sorry for the delayed response.
I have recorded a screencast before and after activating the plugin.
I am running tests on a localhost and no other plugins are involved except the two.
Please see here: https://vimeo.com/362043236
Also now I discovered one more issue.
Whenever I change a Theme, all the custom sidebars get changed or entirely removed.
See in this screencast: https://vimeo.com/362043351
When I changed it to a default theme, The sidebar which I configured using custom sidebars disappeared from the widgets section.
