This apps only purpose is to open the built in Android's Settings.
It has been created as some Vendors have hidden or removed the link to open Android's settings.
If you have the 'Settings' app listed in your app drawer then this app has no purpose for you.
In some cases this app may not work for you at all.
How to install Open Hidden Settings APK?
2. Click the download button to download Open Hidden Settings.Once the download completed,find Open Hidden Settings in your download folder or notification center and tap the icon to install the APK.
3. Find Open Hidden Settings icon in your home screen then tap the icon to open it.