That app is from Cheetah Mobile, which I don't trust at all. If you can, I suggest uninstalling any Cheetah Mobile app from your phone. Apart from a history of shady and sneaky practices, their apps (like Clean Master) claim to improve performance by doing things that run counter to how Android is designed to work, and which can ultimately hinder performance.
I'm aware that Samsung incorporates some of Clean Master's features in its Device Maintenance app, which makes me shake my head a little. So you might not be able to get rid of all of Cheetah's influence.