In 2020, Facebook announced that they would be introducing a new Facebook Business Page layout called New Pages Experience. Since then, the've been inviting businesses to switch their Business Page to this new platform even though it's still being developed.
According to Facebook, the new Page experience layout offers a cleaner and more intuitive design, actionable insights and more relevant notifications and updated page management tools.
As it turns out, this new design also pushes out third-party integrations, including the Real Facebook App.
Thankfully, there may still be time to switch back to the classic experience for many pages: Facebook has shared instructions on how to go back to classic pages, and even to mkae sure that all your content comes with you. Take a look at this Facebook Help article for more info.