Sometimes even the best plugin wants to be uninstalled!
So, if you like to uninstall WP Staging and remove all of its data and settings completely just follow the steps in this article.
Go to WP Staging > Settings and select the option
Remove Data on Uninstall
If you also want to delete all staging sites go to WP Staging > Sites and use the DELETE button on every site listing entry:
After that go to WordPress > Plugins and deactivate and uninstall WP Staging
It may be possible that there are still certain tables available in the database which have been created by wp staging for backup purposes.
They begin with wpstgbak_ or wpstgtmp_
You can remove all of them completely by using PHPMyAdmin or any other database administration tool of your choice. (We love adminer!)