Thanks Vladimir. I never though It will delete my current settings.
Reset means it will reset its own settings to zero day.

I export user roles from my dev site and import here. Seems solved. I installed woocomemrce and it didn’t worked.

I have few very important suggestion for newbies like me.

1. Reset means reset in all of the plugins. They never touch other areas. If we want to delete user roles we can do it with few clicks. I believe that button’s action should change.
2. If you can’t change it for any reason, Please put “get it back button” just next to reset. So we can get it back with one click. Since you already backup default setting.
3. Please update you document with images. There is no image in both page.

How to restore deleted WordPress user roles