Please follow these steps to uninstall Nested Prefabs:
- Delete the "Nested Prefabs" folder in your project.
- A dialog box will pop-up asking you if you want to uninstall Nested Prefabs. Choose "Uninstall".
- Nested Prefabs will be uninstalled and all additionally stored data will be removed from your project.
- Restart Unity.
Nested Prefabs will automatically remove all internal components from your prefabs. However, sometimes it can happen that not all components were removed during uninstall. If this happens then you can clean your project with the script in the following article: There are missing scripts in my project